Help with spell by GUI

Level 2
Joined
Jul 3, 2014
Messages
14
I need to do this spell :
"Passive"
If hero takes damage bigger than 20% of his max HP then one of his abillity become castable. (add abillity)
 
Level 2
Joined
Jul 3, 2014
Messages
14
If hero takes damage bigger than 20% of his max HP, turns on the switch that gives him a new spell and when he used it or wait five seconds disable that abillity.

Tickles i really don't know how to change that spell from divine shield to another spell.
 
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