The closest to in-fighting in DCSS is a wand of charming that makes an enemy fight for you for some time. Unfortunately, it’s single-targeted and can fail against its target’s willpower.

If I would need to open this mess and deal with it, I’d do the following:

• Clear the entire floor first, making sure to not disturb anything inside with noise (they won’t open the blue doors but that’ll still mess up my plan, see below);

• Open the blue doors then make a few steps away from the vault (enemies are still not aware of me);

• Drink a potion of lignification that will turn me into a tree (we’ll need it for a later step);

• Probably drink some other potions like resistance (to not be one-shotted by the dragon), invisibility and especially haste;

• Shout to attract attention of the enemies;

• Read a scroll of immolation - it applies a special status effect to all enemies, making them take additional fire damage when they lose health and explode when they die, heavily damaging anyone who stands close;

• Read a scroll of torment halving everyone’s health in half (which is considered an attack, so it’ll trigger the immolation’s fire damage) - it usually applies to the player too but the tree form grants immunity to it;

• Read torment again if it wasn’t enough;

• Read a scroll of teleportation and then walk around the floor, killing off whoever is still alive.

With this plan, my chances to win would probably be higher than the risk of death.