Mark of Corruption

From WoWWiki

This spell is cast by Hydross the Unstable during its poison form phase.

Rank Table

Nr of debuffs	Description
1	Nature damage taken increased by 10%.
2	Nature damage taken increased by 25%.
3	Nature damage taken increased by 50%.
4	Nature damage taken increased by 100%.
5	Nature damage taken increased by 250%.
6	Nature damage taken increased by 500%.