Triggered Spell Damage Issue

Say for example I have a spell thats damage is done by a trigger with something like set target life = target life - 300. Because this damage is done by the trigger, the unit casting this spell isnt getting credit for killing anything with the triggered damage.

I have been messing with damage source conditions but havent really come up with anything solid.

Does anyone have an idea how I would give credit to the caster of the trigger that does the damage?

In 1.17, blizzard added functions that allow you to trigger one unit damaging another unit or an area, along with some fancy stuff for controlling damage type. Since kills and cash are creditted correctly that way, it should do fine.

Thanks i got it working now, was a little unclear how the Unit - Damage Target function worked.