Spellpower based casters (Anorithil, Paradox Mage, Archmage, Alchemist, Necromancer, Corruptor):
MAINHAND: staff
OFFHAND: none unless a 1H weapon is equipped in MAINHAND
Alchemist:
QUIVER: alchemist-gem

Oozemancer, Summoner, Doomed:
MAINHAND/OFFHAND: mindstars

Stone Warden:
MAINHAND/OFFHAND: shield or weapon with the block combat field

Brawler:
MAINHAND/OFFHAND: unarmed

Reaver:
MAINHAND/OFFHAND: 1H weapon

Archer:
MAINHAND: Archery weapon
QUIVER: Ammo must match type of MAINHAND weapon

Temporal Warden:
MAINHAND: longbow
OFFHAND: none
QUIVER: Ammo must match type of MAINHAND weapon
QS_MAINHAND: 1H weapon

Sun Paladin, Bullwark:
MAINHAND: 1H weapon
OFFHAND: shield or weapon with the block combat field

Berzerker:
MAINHAND: 2H weapon
OFFHAND: unarmed

Rogue, Shadowblade, Marauder:
MAINHAND/OFFHAND: dagger
Rogue, Shadowblade:
BODY: light or cloth armor

Skirmisher:
MAINHAND: sling
OFFHAND: shield or weapon with the block combat field
QUIVER: Ammo must match type of MAINHAND weapon

Some NPC Entity updates:
Bosses in Trollmire, The Maze, Daikara, Dreadfell, Elven Ruins, High Peak, Orc Prides,
Assassin Lord, Tannen, Golbug, Corrupted Oozemancer,
Some major and minor demons, various caster npcs, many orcs, thieves, minotaurs, yaechs, naga