Casting Corruption http://wotlk.openwow.com/spell=47813 with Improved Corruption http://wotlk.openwow.com/spell=17814 doesn't add any bonus damage. I used a fresh new lvl80 character with just Corruption rank 10 learnt and Improved Corruption rank 5 on the test dummies at Stormwing (same result with all dummies), doing always 180 dmg per tick
03a5d6d#commitcomment-11443669
Definitely related to #14812
Casting Corruption http://wotlk.openwow.com/spell=47813 with Improved Corruption http://wotlk.openwow.com/spell=17814 doesn't add any bonus damage. I used a fresh new lvl80 character with just Corruption rank 10 learnt and Improved Corruption rank 5 on the test dummies at Stormwing (same result with all dummies), doing always 180 dmg per tick
03a5d6d#commitcomment-11443669
Definitely related to #14812