replace Holy with 'Yin and Yang', make it a possible add on every item (as rare as attack speed add), remove Holy/Yin and Yang from Tao weapons.
All damage abilities vs undead
Warrior :
Halfmoon/Crosshalfmoon - every +1 takes away the aoe damage penalty (up to penalty 0%)
Blade Avalanche - every +1 adds 10% damage (up to 100%)
Every +1 increases total AC+AMC +5%, up to 50% (no fuking Warrior itemizes defensive items in PvP, now a reason to, maybe they need a utility skill to promote being more of a tank though)
Tao:
Increase healing effectiveness up to +10% every +1 based off targets missing health (up to 100%) ( target is 100% = healing effectiveness 10% with +1 or +10, target is 10% health = 100% healing effectivness with +10, +1 is 10%).
While monster is trap hex'd, Soulfireball/DarkSoulfireball deal 5% of targets max health additional damage per +1, up to 50%.
Pets have a chance to be immune to evil (all damage from undead, Lightning, Thunderbolt, Thunderwave, and TU, 5% per one up to 50%).
Just ideas with too much spare time
I'd want it to be a versatile option for every class though and have 1 benefit for PvP spec.
What did Hallu do on that server/
It made the monster completely into an ally, like your pet, meaning it would soak up mob agro.