Wand of enslavement
|A magical device which causes slavish obedience in a creature.|
A wand of enslavement will attempt to charm the creature it hits, temporarily making it fight for you.
Monsters cannot use this wand on a player. A player may zap it at themselves, which causes them to become confused.
This wand's uses are obvious, especially if you enslave the biggest monsters in a group. Many a big kobold, orc knight, and orc warrior has been robbed their chance to murder a low-to-mid level player this way, instead felling only their own weak allies. Packs of killer bees are also a good target for enslavement to avoid being swarmed. Another popular technique is when you're fighting groups in a one-tile corridor, by enslaving the "front" monster and letting it die blocking for you. Use this wand to help deal with casters, too - they might be able to shrug off the effect, but the dumb basher next to them probably won't!
Less obvious is that you should be liberal when using these wands. Again, their effect can be resisted, and if you save them until you're deep in the Dungeon (where monsters tend to have more magic resistance), you may not get as much mileage out of them.
That said, try to keep a charged wand of enslavement on hand at all times, in case you run into monsters that are problematic to kill yourself, such as mummies.