Random stab at most OP additions:
Bard - Triple Attack (or ability to be halflings
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Monk - Slow
Shaman - Mez (Also, snare pls)
Pal/SK - Defensive Disc
Ranger - Block
Druid - Pet
Necro - Chloroplast
Warrior - Mend
Magician - Mez (or maybe just Root)
Cleric - Lich
Enchanter - FD
Rogue - Critical hits / Berserker Frenzy?
Wizard - Clarity