Stone Hide

From AoCWiki

3 ranks, Tier 6, Pre-Req: Poisoned Hide

Increases immunity by 10/15/25% for the duration. 15s duration and CD 2m.

Not confirmed: As at 02/06/08 this feat might be bugged. At rank 3 it will decrease each hit by 25 not 25%. EG A 1000 hit will hit for 975.

If the above is true and it does not scale with level then this feat will become wortless at level 80.