I hope this is the right place to post this list. It's not completed yet but it might be useful if you don't want to waste your disarm attempts or if the staff wants to modify some immune mobs eventually.
Have fun

- Orc Raider 1°) Bow [EFFECTIVE] 2°) Falchion [EFFECTIVE]
- Orc Raider Mystic 1°) Staff/Spear [EFFECTIVE]
- Orc Raider Brute 1°) Spear [EFFECTIVE]
- Ogre 1°) Big Mace [NOT EFFECTIVE]
- Gnoll Scavenger 1°) Sword [EFFECTIVE]
- Gnoll Marauder 1°) Spear [EFFECTIVE]
- Gnoll Shaman 1°) Staff [EFFECTIVE]
- Greh'Khlohk The Slayer 1°) Great Axe [EFFECTIVE]
- Gnoll Skirmisher 1°) Throwing Axe [EFFECTIVE]
- Gnoll Occultist 1°) Staff [NOT EFFECTIVE]
- Xvart Warrior 1° & 2°) Short Swords [NOT EFFECTIVE]
- Xvart Shaman 1°) Staff [NOT EFFECTIVE]
- Xvart Archer 1°) Bow [NOT EFFECTIVE] 2°) Sword [NOT EFFECTIVE]
- Duergar Doomsayer 1°) Mace [NOT EFFECTIVE]
- Duergar Berserker 1°) Great Axe [NOT EFFECTIVE]
- Hill Giant 1°) Log [NOT EFFECTIVE]
- Barbarian Giant 1°) Log [NOT EFFECTIVE]
- Giant Brute 1°) Log [NOT EFFECTIVE]
- Frost giant Warrior 1°) Great Axe [EFFECTIVE]
- Frost Mage 1°) Staff [NOT EFFECTIVE]
- Goblin Soldier 1°) Morning Star [EFFECTIVE]
- Goblin Sapper 1°) Morning Star [EFFECTIVE]
- Goblin Crusader 1°) Spear [EFFECTIVE]
- Goblin Fanatic 1°) Morning Star/Spear [NOT EFFECTIVE]
- Goblin SoothSayer 1°) Staff [EFFECTIVE]
(I'm not 100% sure about the kind of weapons that they're actually wielding but it should be close enough)
TO BE CONTINUED...