Spell that does three things

Spell that does three things

How cud you add slow to an ability like impale rather than stun

Dummy casters? Basically spawn some unit with a perfect slow ability, where it has no cooldown, cast time, mana cost, etc. Creat it when the unit starts casting, wait a sec to get all the units on the ground, then pick all units within 1000 of the caster, check for buffs, then slow them. After that, remove your dummy

sample

cud u give me a visual example of what the trigger wud be like

Give a dummy unit thunderclap with no special effect, then do the trigger as follows:
Event:Unit casts an ability
Condition:Ability being cast=Impail(or w/e ability you're using)
Actions:Create 1 Dummy Unit at position of triggering unit facing default building degrees.
Order last created unit to Human-Thunder Clap.