Hidden-Hidden Reward

You did Gowlfang good-good, no other gnoll ever do for me like that before! I give you gift show that Mosshide good gnoll, strong gnolls!

I bury-bury chest in hollowed out tree at bottom of dam, should be still there unless someone steal, you find, treasure for you, Gowlfang no need what inside, all for you.

Within the hollowed out tree you see a small pile of muck that is oddly formed.

You notice something glinting within the muck, this must be what Gowlfang had spoken of. Upon searching further, you claim your reward.