i found two pretty nice tricks that i am using in my game.
the first one is making a promethean crouch down and get up whenever you like.
first place a promethean
trigger
active yes
loop on
runemmidiatly on
condition
always (i am using army distance to point so it gets up when i go near it)
Effects
change unit type
source unit: (the promethean)
unit type: promethean
this also works with other things like calladrias and other myth units, norse units make a nice fire.
the second trick aint as good. i gives the impression that a unit is blucking the way.
just use the trigger move to unit on loop and put invisible walls between them.
hope i helped!