Sending scarabs out from the player is a must for an rpg. It looks sexy and powerful and manly.
You could do it using falkoner's mobile grid thing with the crystals to aim it, or it could be self aiming. (As long as the enemy is also an enemy to the computer owning the scarabs.)
Holy Light, lots of spider mine and dropship explosions, and have firebat sprites stacked onto your hero, making a sort of melee ranged damage spell.
(Lightning, Holy) Shield: A science vessel casts defensive matrix on your hero. You could either have a computer do this, or just create one for the player, and tell the player to manually cast defensive matrix.
Pacify: Disruption Web, again, either have the player manually cast it, or have the computer cast it, then move the d web to where ever you need it.
Decay, Rot, whatever you want to call it: Irradiated air units circle around an area, causing damage to nearby units.
Mirror Image/Split: Create a hallucinated version of your hero, or, if your hero character has multiple of similar units (ie. zealot, Fenix, or raynor, marine) they have less damage and life.
Penitence/Tether: Maelstrom a unit or several units.
Freeze: Have an arbiter cast stasis, and you could use your vHP system to deal damage over time to the units.
That's it for now.
None.