Here is the full list of Scorn enemy unit types and weapons:

Screeb: we all know these. 4 arms?

Stalker: dregs, basically. instead of shock daggers they have a mace. they also carry a pistols that shoot void or arc. also throws void grenades similar to shock grenade. 2 arms.

Lurker: these are stalkers with the shields instead of maces. they usually have the miniaturized shrapnel launcher. 2 arms.

Ravager: these are the headless ones that have the flaming mace/censor thing. 2 arms.

Wraith: these are the ones that charge in with two flaming torches. 4 arms.

Raider: these are the ones that can turn into ether and move away. Typically have the Scorn rifles that show void sawblades or the scorn crossbow. rarely do they carry the mine launcher. 4 arms.

Chieftain: the totem ones. carry either the Scorn rifle that shoots the sawblades, the minelauncher, shrapnel launcher or, the Scorn cannon the shoots molten metal. You may have seen these it looks like showers of sparks or comets or lava being launched. 4 arms.

Abomination: the big guys. shoots charged ether.

To recap the weapons:
Blaster: void
Repeater pistol: arc
Pistol: mini shrapnel launcher
Rifle: void sawblades
Crossbow: Void, shoots three projectiles in triangle
Mine launcher: shoots literally shock mines similar to skiffs and pikes.
Shrapnel launcher: classic.
Cannon: the molten metal
Flame torch: Wraiths
Flame Censer: Ravagers
Mace: Stalkers
Charged Ether: Abomination