As mentioned last week, Shattered Pixel Dungeon's upcoming Cleric hero has a variety of unique spells which they can access via their holy tome. The first of the Cleric's spells is a simple supportive ranged option: Guiding Light.
Guiding Light is an innate spell (no talent needed to unlock) and does some damage while 'illuminating' the target. This guarantees that the next physical attack made against that target will hit.
(Image Description: a short GIF showing off the guiding light spell. The Cleric casts it on an enemy, which begins to glow. The Cleric then waits for the enemy to approach, and attacks them.)
Mangband is a realtime multiplayer modification of Angband that forced turns every N amount of time, and while it is playable, yeah, I don't think that straight multiplayer conversions of traditional roguelikes work well.
Someone who wanted to try to do a "multiplayer traditional roguelikes" ' would probably need to make a number of game design changes at a pretty fundamental level to make the thing work well. Really a new game.
There are some multiplayer roguelites out there:
https://old.reddit.com/r/roguelikes/comments/auzail/best_coop_multiplayer_roguelikes/
That might kinda be something that the parent poster would be interested in.