I feel like the Act 3 merc needs some work to be more viable/useful.
Here is my proposal.
Overall: Allow them to use paladin shields.
Normal Mercs
Fire: Fireball, Meteor, Fire Mastery
Lightning: Charged Bolt, Lightning, Lightning Mastery
Cold: Ice Blast, Blizzard, Cold Mastery
Nightmare Mercs
Bone: Teeth, Bone Spirit, Amplify Damage
Poison: Poison Explosion, Poison Nova, Lower Resist
Holy: Holy Bolt, Fist of Heavens, Heal (Target heal with small AoE)
Hell Mercs
Fire: Merc Enchant, Hydra, Fire Mastery
Note: Merc Enchant has a small AoE
Lightning: Static Field, Nova, Thunderstorm
Cold: Chilling Armor, Frozen Orb, Cold Mastery
Other possibilities:
Attack Merc: Blessed Shield, Smite, Charge
I think this would make a viable Act 3 merc more viable.
Thanks for reading,
Floopay