You fume celestial force and utter the words (holy bolt)
--- Holy Bolt - Green Slaad. resists 0% (1/7) (detonating)
Surges of holy force coil around your Feather Cross forming a sparkling bolt
of divine energy. You twist your wrist and bolt hurls through the air
detonating on Green Slaad.
Holy white flames dances around you.
Old nun arrives in a puff of smoke and mutters, 'You have slain down all the
slaads within one day. Magnificent, you remind me of myself when I was at your
age. Ah, your reward, here is a key that I confiscated from a fiend. I am too
old to find out which door this key fits in.. although I have a pretty good
idea. Good luck, may Las guard your journey.'

Old nun gives you a key.

* CONGRATULATIONS! You have completed nun task 'Slaad hunt'*

Green Slaad dies in a massive fit of convulsions.
Green Slaad is DEAD, R.I.P.
You enjoy seeing your enemy in pain and are drawn toward the cold abyss.