How to make horse mob suicide & give an item when damaged/dismounted?

I'm trying to make a horse mob that kills itself and gives the player an item that you could use to spawn it back in whenever it is damaged or dismounted.

Mob file:

RegularMount:
Type: horse
Display: '&8&lHorse'
Health: 30
HealthBar:
Enabled: false
Offset: 0.5
Faction: Mount
Skills:
- skill{s=RegularMountHit}
- skill{s=RegularMountDismount} ~onTimer:1
- skill{s=RegularMountRemove} ~onSignal=DISMOUNT
Options:
AlwaysShowName: false
HorseTamed: true...

How to make horse mob suicide & give an item when damaged/dismounted?