how to create a trigger that the unit is trapped? and a trigger about this spell

[soulmaka]

how to create a trigger that units are trapped? like they can't get out within 500 AOE??



and how to create this trigger with this kind of spell?

Create Golem - Channels (draining mana) until interrupted, ending it or get out of mana. When this happens, a golem is summoned. Type of golem depends on casting time. For example, when the spell is on level 1, it could be
1-10 seconds casting time = mud golem
11-20 seconds casting time = stone golem
21+ casting time = granite golem
apart from the casting time landmarks, expiration timer could increase with higher levels in the spell

do i need 2 separate triggers for this spell right? because of the timer...

 

[Accname]

depends on what these spells should be like, MUI? MPI? only work on computer owned units or player owned as well? (the first one)

 

[soulmaka]

depends on what these spells should be like, MUI? MPI? only work on computer owned units or player owned as well? (the first one)

MPI.. player only..

btw.. you know how to make a trigger on the second one? how to summon golems depending on the time casted?