Perhaps not on a diremare / ensnaring spider / psi shark / bitter wing / cliff sprite / your choice.
But in the monastery ...
level one, last crab on the beach, only rogue on the front protected by fighter and training stealth, mind stab from psi, sleep from alchemist, heal from priest, rinse, repeat, not ad aeternum: when stealth is about 60-65, crab just runs away.
And be fair play, after torturing the beast (?) during three days, let him live !!!
The few points you gain in mental are very useful (cast one time insanity/1 in yellow at level 3, figher insane, bishop dead).
Repeat with a lone green slime, the last rat/bat/roach of a bunch