So I've been spending a lot of time lately with James Raggi's Random Esoteric Creature Generator, rolling up monsters for the Once-Green and Pleasant Land setting as I get closer to being ready to start running adventures in it. Here's one that I don't see myself using any time soon so it's worth using as a teaser:
# Appearing: 1
Armor Class: 14
Hit Dice: 11
Movement: 130 (Swimming)
Attacks: 1 (Gore With Antlers)
Special Ability: Spell Use - Wizard Spells
Conflict Motivation: Hunger
Combat Strategy: Random
The Great Sea-Stag patrols up and down the Dover coast of England, an enormous and savagely hungry beast, the size of an elephant, with a long neck and four paddle-like flippers - resembling the Plesiosaurus of Earth's prehistoric past. It's short-snouted, bulging-eyed head is flanked by large, flapping gills and topped by a pair of 8-point antlers of twisted, gnarled bone.
More disconcertingly, the Great Sea-Stag can cast a small number of arcane spells to aid it in collecting human prey. It has been observed casting Charm Person, Sleep, and Web. It may know other spells besides.