Not useful. definitely not. first, the food needed. you ned to buy some lizs first.
Note that this was tried with an orcish priest, not VERY useful, and there was an altar (co aligned) (useful). From what i noted before stupidly stopping all water traps, you can't really get items due to gremlisn almost instantly generating. Also, the number you killed leveled them up ALOT. and when i say a LOT, i mean it. When i had cleared the traps, a gremling got me to very close. One also reduced me to 1/2 hp. Oo