A Bottle of Whoop Gnash!

Objectives
You must slay Gnash.

Combine 3 Grouper Liver Oil from with the Enchanted Coral, then use the Enchanted Sea Snack on Gnash to weaken him. Provided item: Enchanted Coral
 * slain

Description
The note in this bottle is soaked through, but still legible. It reads:

Report to :

My painstaking study of our nemesis, Gnash, has finally yielded fruit!

I've discovered a temptation he cannot refuse! A bit of fish liver oil on a crunchy piece of coral seems to please his picky palate to no end.

I've taken the liberty to imbue the enclosed piece of coral with a special shrink enchant that should bring the brute down to size.

In your service,

Rewards
You will receive:

Completion
The Gilblin's menace has been undone!