The dwarf lord, h, is a monster in NetHack. They possess a potential two attacks per move; since they are sometimes generated with a dwarvish mattock they can thus be extremely hazardous. Dwarf lord can and will use certain items such as wands and potions. Dwarf lords can also tunnel through rock. Beware!
This is one of the reasons why you would want to gather junk and dump it on Elbereth-protected piles.