It was defintly blight (or pestilence) that damaged your units. It also applies a significant temporary health penalty to your cites. It wears off at 1 point per turn. Health effecting buildings (and civics etc) will minimize the effect of blight but if your playing a true Calabim leader they probably arent high on your priority list.
Thank-you, that's good to know. Just co-incidental timing I guess.
Sometimes enraged wears off. Sometimes it doesnt and the unit goes barb, it just depends on how lucky you feel.
Aye, I know the enraged bit, but I think the 2 copies of the vampire lord is the bug. Immortal units don't die with enraged, they just change sides (Would any other side swapping mechanics trigger this?). In a 'lore' sense it's broken I'd say... but in a 'player' sense I got to keep my unit. Depends on the purpose of Immortal I guess.