"True damage offers pretty clear feedback: the damage you see is the damage you get...
...no decreases or increases. Mountain Drake was violating that expectation (especially around smite fights), so we’re bringing it in line with the rest of the game."
Turrets Turrets now take less true damage when the backdoor bonus is in effect.
Turrets have always had a pretty massive defensive boost to discourage raw backdoor attempts, but with the increased prevalence of True Damage in the game (Mountain Drake, Red Buff) we’re adjusting to keep it in line. REALLY REINFORCED ARMOR Now additionally absorbs 66% of true damage when the backdoor bonus is in effect
lol

Atleast its clear what killed me.