Hostile spawns

how do you make a tavern type building that will create hostile units for training?

and just so i don't have to spam the board
how would i make a giant comet like the one sephiroth uses in anime fight?
how do you make abilities do damage+stat
and is there a way to make an ability kind of like cluster rocket but targets a unit instead of an area?

1. Goto the tavern building in the unit editor. Scroll down to techtree. Click on units sold, and put your hostile units in there.

2. For giant comet, you have several options: the inferno effect, custom model, or a skilled use of rain of fire / inferno / etc.

3. For damage+stat or damage*stat, make a trigger that checks when a unit starts the effect of an ability, and if the ability is equal to a certain ability, deal damage equal to whatever * str/agi/int.

4. Cluster rockets for units: use storm bolt with a higher pitch angle thingy and the cluster rockets effect, and for each unit in a region create a dummy caster that will cast that spell.

ok, thanks ,but that tavern thing did not work the way i intend it to, i wanted it to spawn units that belong either to neutral hostile or another player so i can fight them for XP

Here you go:
Should work simply enough

Even easier, though would be this trigger, as long as the units you're making hostile are only existant in the map when they're bought at the tavern...

For the cluster rockets, simply use a dummy targetting spell, then make a dummy caster use the real cluster rockets at the position of the target unit.