The only way i know how to do it, is to trigger every single healing spell you use.
event unit starts effect of ability
condition ability equal to holy light
action - if/then/else
Set holylighttarget - unit ability being cast on
if holy light target has buff equal to mortal strike
then create 1 dummy at possition of triggering unit
add holy light(mortal strike) to last created unit
order last created unit to paladin holylight holylight target
Else
then create 1 dummy at possition of triggering unit
add holy light(Normal) to last created unit
order last created unit to paladin holylight holylight target
then create 2 holy lights, 1 heals for half, one heals for full
you could detect when a heal spell triggers and then damage the player afterwards for the amount it should reduce with, this will however bug when the heal gets the player to full health
I'm on a page about incorrect corrections, and spent the better part of like two hours trying to get someone to understand that -5^2 = -25, not 25, and then that post had comments get reposted because that group is self sustaining, and that person was in turn trying to explain what I just explained to them. And I'm taking that as a victory
I will be AFK for a couple of days you guys hold down the fort while I am gone. I will be checking in on my phone but that will severly limit me. Be back saturday!