Hey All,

Been crunching some numbers and things have gotten rather confusing in some cases. Testing was done without champ points that increase spell/ability dmg (which doesn't show on tooltip) and we just added points into either Blessed (for baseline) or Spell Erosion (for testing spell pen)

Questions:
1. Can spell resist go into the negative, thereby causing a mob to take more damage than stated in an ability tooltip?

2. Is it intended for spell penetration to cause negative spell resist?

Tests:
numbers are Base TT dmg/no spell erosion/100 spell erosion

Ice Wraith (fire vulnerable mob)
Fire: 3370/3593/3593
Ice: 3180/2957/3180
Lightning: 3180/2976/3180
Magic: 3180/2918/3180

So this one makes sense, the mob starts out with some resistance to ice, lightning and magic and when spell erosion is at maximum all resist is negated and the abilities do the damage stated in the tooltip. The mob is fire vulnerable and using more spell pen has no effect, if this is calculated using negative fire resist it is as low as it is allowed to go.

**vulnerable mobs take an extra damage hit, a proc, and is how I identify them, this is seen in Recount or FTC as "Explosion" for Fire vulnerable mobs**

Mammoth (neutral mob)
Fire: 3370/3363/3978
Ice: 3180/2957/3180
Lightning: 3180/2976/3180

Mammoth appears to have less Fire resist than it does Ice and Lightning resist: only does 0.2% less dmg with Fire while Ice and Lightning do 7% less dmg. What doesn't make a lot of sense is after spell erosion is set to 100 the Fire dmg does MORE than the tooltip value, both Ice and Lightning appear to behave as though resists have been set to 0 (do the same dmg as tooltip). This makes it appear as though the Mammoth's Fire resist is being pushed into the negative and it begins to take extra dmg from Fire attacks!

Fire Atronach (Frost vulnerable mob)
Fire: 3370/3249/3641
Ice: 3180/3284/3284
Lightning: 3180/2896/3243

So just like the Fire vulnerable mob, the Ice dmg bonus appears to be fixed and does not change with increasing spell penetration. However, both fire and lightning do more damage than stated in the tooltip, again it looks like the mob is allowed to go into negative resists. It does start with some Fire and Lightning resist as evidenced by the change in dmg when spell penetration is increased.

If mobs are allowed to go into negative resists, it doesn't seem to be the same low end on every type of mob. Mammoth took 15% extra Fire dmg, Atronach took 7% extra Fire dmg and 2% extra Lightning dmg.

This seems really strange and I do want to know if spell penetration is intended to make a target vulnerable by bringing spell resist into the negative...