Currently, there are only a few monsters (Trojans, Alpha Wolvers) who can buff
themself or other monsters. It would be awesome if we could do that as well!
Staffs or wands perhaps? They fire projectiles (mainly elemental damage) as main
attack and charge would cause the player to buff all the players nearby, giving
some offensive or defensive bonuses. I was also thinking of equipment that has
auras.
A venom veiler may not buff us but it reduces enemy defenses. We end up dealing more damage anyways, just like your wand thing.
Your way of doing it is different, but we can argue it's already implemented in the form of poison weapons and vials.