FR EN DE ES IT PT
Browse forums 
Ankama Trackers
Pinned

Erosion and You! A quick general guide to the Erosion mechanism.

By Muniamx - FORMER SUBSCRIBER - November 27, 2012, 18:20:36

Hello everyone, and welcome to this small guide concerning the Erosion mechanism, because the Wikia is undoubtedly outdated, and several opponents are still confused of how it works.

[size=16]Erosion? What is that?[/size]

Erosion, also known as permanent health loss, is a mechanism that been implemented ever since 1.27.0 (March 2009). Back in those days, you had the default 10% health loss and aside from Sacriers, no other classes could inflict (or self-inflict) Erosion, so while it was a relevant mechanism, it really wasn’t anything to concern yourself with outside of very long fights involving healers.

More specifically, at that time Erosion meant that a fraction of the damage taken (10% for everyone except Sacriers under elemental punishments) was also deduced from your maximum health, and couldn’t be recovered until the fight was over.

With the occurrence of Frigost, and later Rogue, some way to deal Erosion were implemented, and Erosion was capped to 50%.

[size=16]Okay, I get it, but why are you bringing that up now? It seems irrelevant… [/size]

“Recent” changes to Erosion, mostly in 2.5.0 (December 2011) has given an additional role to Erosion. Not only are damage dealt unhealable to an extent, but eroded damage become armor-piercing . To aid in this role, several classes, namely Iop, Ecaflip and Sram, were given way to increase Erosion on their target, while Eniripsa received Erosion penalty on some of their spells (Stimulating, Draining).

[size=16] Armor-piercing? Do go on… [/size]

The way Erosion is managed ever since 2.5.0 is fairly simple.

Your base damage (The damage you would deal on unbuffed foe, before they are given spell-given resistance (or negative resistance via Vulnerabilities, for that matter) and/or armor) is multiplied by their Erosion factor, which goes from the base 0.1 to 0.5 (10% to 50%). That damage is then dealt to their maximum health.

Example: Your Iop casts Concentration, dealing 200 damage to the 10000 health poutch. The poutch health display is now the following: 9800/9980. The 200 displayed damage were dealt to the left number, while the Erosion damage (the base 10%, in this case, means 200*0.1 = 20) were dealt to the right side number.

[size=16]Okay, so the poutch cannot heal himself back to 10000. Big deal. Still doesn’t see how that mean it Armor-piercing. [/size]

Yeah, that’s entirely correct. Erosion is useless against an undefended foe that cannot even heal himself. However, a Feca has joined the poutch team, and casted earth armor, reducing damage by 300 earth damage (For the purpose of the demonstration).

Example: The Iop cast Concentration again, and deals 200 damage to the 10000 hp poutch. However, the 200 damage is reduced by the 300 armor, and deals 0. However, the 200 damage is still multiplied by the 0.1 Erosion factor. The Poutch would now be sitting at 10000 / 9980 hp.

However, your current health can never exceed your maximum health. As such, in the previous example, the Poutch current health would drop to 9980 / 9980 hp.

[size=16] I can see how that would be considered Armor-Piercing, but I’m not going to kill anyone with only 10% of my actual damage working… [/size]

As I mentioned earlier, Rogue’s Blunderbuss, Ecaflip’s Reflex, Sram’s Mistake and Iop’s Pressure may be used to increase Erosion on a target.

Example: Our Feca casts Immunity on the poutch. The invulnerable effect reduce the base damage to 0, and prevents Erosion from dealing damage to the maximum health. However, the Iop decides to hit the Poutch with Erosion twice, doing a Critical hits both time, and dealing 40% more erosion to the poutch on top of the base 10%. The poutch now take 50% erosion. On the following turn, the Poutch, still under the Earth armor, reduce the concentration cast of 200 damage to 0, while the maximum health gets reduced by 200*0.5 = 100. The poutch now sits at 9900/9900.

Now 50% of your damage are still managing to get through. Not so bad. The same would still applys to Truce.

But Erosion also ignores (spell-given) Resistances.

Example: As Earth Armor elapses, the Feca casts Feca Shield on the Poutch, doing a critical hit and bringing the Poutch resistance to 55%. The Pressure debuff is still there, and the Concentration of 200 deals the following damage: 90 damage to the current health (200*(1-0.55)) and 100 to the maximum health: The poutch is now sitting at 9900/9900, as the Erosion damage dealt is superior to the actual damage dealt.

And combined Resistance and Reduction.

Example: The Feca recasts Earth Armor. However, he got deleveled, and is now reducing for 150 damage. The 200 concentration is dealing (200-150)*(1-0.55) = ~23 damage via the Regular hits. However, Erosion is still making the maximum health tanks 100 damage. We’re still sitting at 9900/9900.

In all 3 previous example, if the poutch was to lifesteal, or be healed, it would have no effect, as he is currently maxed out.

I hope these example were clear enough to explain how Erosion can be tactically useful to pierces Armour, defeats Eniripsa and Feca teams, or why that team is hitting you for 0 during Truce.

Do note that Shield Point (From Masqueraiders) do NOT prevent Erosion. Damage dealt to shield still erode your max health.

As a footnote, the display is still bugged in some cases if you bring Erosion to above 50% (Via, for example, a twin Reflex cast). In that case, two L6 Reflex cast would bring the target to (45%*2)+10%=100%, and you would see the target takes 100% of the base amount. However, the actual damage dealt to maximum health is still 50%. You will realize this when you bring the target’s health to a displayed 0, and he’s still alive.

Also note that you cannot bring a target health below 1 via Erosion. An actual damage dealt need to be done to finish them off.

PS: Native resistance and Reduction (Gears, etc) reduce the base damage. Hence you cannot use Erosion to deals damage to bosses with Elemental immunity, and players will use the amount after their base resistance and reduction as the base amount used for Erosion.

PPS: For clarity purpose, the poutch is always brought back to 10000 in each example, though he wouldn't be healable to that amount wink 

6 0
Reply
Reactions 13
Score : 1994

Very helpful! I wasn't aware of Erosion's armor-piercing capabilities. And I always thought the 50% maximum on Erosion meant that maximum health couldn't drop below 50% of its normal value, which apparently is not the case. XD

Regarding monsters with 100%+ resistance to a particular element, do they take Erosion damage if that resistance is brought down enough for them to be damaged, either through a Pandawa's Vulnerability or a fight mechanic specific to that boss? (Such as Gourlo the Terrible's barrels.)

0 0
Reply
Score : 1808
JebinZedalu|2012-11-27 18:55:25
Very helpful! I wasn't aware of Erosion's armor-piercing capabilities. And I always thought the 50% maximum on Erosion meant that maximum health couldn't drop below 50% of its normal value, which apparently is not the case. XD

Regarding monsters with 100%+ resistance to a particular element, do they take Erosion damage if that resistance is brought down enough for them to be damaged, either through a Pandawa's Vulnerability or a fight mechanic specific to that boss? (Such as Gourlo the Terrible's barrels.)
I am not sure actually, I'll try and verify that when I've a chance.

Edit:
Monster with ABOVE 100% BASE resist do not take Erosion damages until they drop below that. Erosion also accounts for Negative Res for the base amount. (Our bherb had taken ~680 Erosion at 10% base after getting his entire 6800 hp depleted)

Monster that have BELOW 100% BASE resist does not seems to become immune to Erosion if they reach 100% afterward (Via Feca Shield, atleast).

Players spell resistance or vulnerability never influences Erosion dealt.
0 0
Reply
Score : 319
JebinZedalu|2012-11-27 18:55:25
Very helpful! I wasn't aware of Erosion's armor-piercing capabilities. And I always thought the 50% maximum on Erosion meant that maximum health couldn't drop below 50% of its normal value, which apparently is not the case. XD

Regarding monsters with 100%+ resistance to a particular element, do they take Erosion damage if that resistance is brought down enough for them to be damaged, either through a Pandawa's Vulnerability or a fight mechanic specific to that boss? (Such as Gourlo the Terrible's barrels.)
I do not know about this, but I do know that when the boss is not vulne, no erosion will be taken. However, when Immunity/Truce is up, and damage is dealt, you'll still take the perm damage bonus.

My guess is that, when the resistances are taken down under 100%, they will take perm damage, since it's 10% of any damage taken.
0 0
Reply
Score : 413

Thanks, now it will be easier to win against Fec/Eni teams!biggrin 

0 0
Reply
Score : 1119
Muniamx|2012-11-27 18:59:19
JebinZedalu|2012-11-27 18:55:25
Very helpful! I wasn't aware of Erosion's armor-piercing capabilities. And I always thought the 50% maximum on Erosion meant that maximum health couldn't drop below 50% of its normal value, which apparently is not the case. XD

Regarding monsters with 100%+ resistance to a particular element, do they take Erosion damage if that resistance is brought down enough for them to be damaged, either through a Pandawa's Vulnerability or a fight mechanic specific to that boss? (Such as Gourlo the Terrible's barrels.)
I am not sure actually, I'll try and verify that when I've a chance.
Edit:
Monster with ABOVE 100% BASE resist do not take Erosion damages until they drop below that. Erosion also accounts for Negative Res for the base amount. (Our bherb had taken ~680 Erosion at 10% base after getting his entire 6800 hp depleted)
Monster that have BELOW 100% BASE resist does not seems to become immune to Erosion if they reach 100% afterward (Via Feca Shield, atleast).
Players spell resistance or vulnerability never influences Erosion dealt.
Great information.

The monster won't be immune to erosion because of the mechanic you described earlier: "...Erosion also ignores (spell-given) Resistances."

So, the monster would still take Erosion damage as long as it's base resists are below 100%. If given Feca Shield to get back to over 100%, Feca Shield wouldn't stop the Erosion damage because the monsters base resists were lowered to lower than 100%.
0 0
Reply
Score : 194

Interesting, I didn't know about Erosion armor-penetration.
But, I have a question. What happens if Poutch is 9000/10000, and then Feca applies shield? Is it still penetrating the armor, or will it just reduce max health?
In other words, after I attack shielded Poutch for 200 base damage with 50% erosion, would it become 9000/9900, or 8900/9900?

0 0
Reply
Score : 1808

The former. Armor-piercing ability only kicks in if the target is at its current max health (Therefore making it slightly useless versus unarmored/unhealable foes... but then again, why are you trying to armor-pierce these?)

0 0
Reply
Score : 2266

The erosion is a debuff which last one turn usually. Is the max hp given back when the debuff ends? Or does the duration indicate that other allies are able to stack up the permament damage?

0 0
Reply
Score : 3868
natliraren|2013-01-27 11:52:39
The erosion is a debuff which last one turn usually. Is the max hp given back when the debuff ends? Or does the duration indicate that other allies are able to stack up the permament damage?
you don't get any of your erosed hp back (exept if you end the fight)
0 0
Reply
Score : 1808
natliraren|2013-01-27 11:52:39
The erosion is a debuff which last one turn usually. Is the max hp given back when the debuff ends? Or does the duration indicate that other allies are able to stack up the permament damage?


Sorry for the delay in answering: It's the latter. Max HP never goes back up over the course of a given fight,
0 0
Reply
Score : 4365

Awesome explanation, the examples you gave were very clear. Thanks for writing this great guide smile

0 0
Reply
Score : 7459

Does the 50% cap only apply for player-casted erosion? Because Kanigloos have some spell which claims to do 100% erosion - does it really or is it still capped at 50%?

Because, differant mechanics appear to work in different ways for summons/enemies, such as the ability to ramp up massive res using Feca's Shield (which used to be an epic combo with living bag. Sucks it doesn't work any more sad )

0 0
Reply
Score : 1808

Just tested it, and no, I wasn't taking 100% health damage.

So go figure why they set it to 100% (Likewise for Ecaflip Reflex level 6). Aside from provoking display bug, there's no reason to have anything stack higher than 40%.

0 0
Reply
Respond to this thread