I'm not sure if it's intentional or not, as it seems to be a bug/feature with both Kog and Karthus. If you kill the Ascended with the passive, you instantly revive and become ascended on the spot. Ways to replicate? 1. Pick Kog'Maw. 2. Die while Ascended is low. 3. Kill Ascended with Passive. 4. ??? 5. Profit.