The official GemStone IV encyclopedia.
The grifflet is a young, yet magnificent beast. Mottled brown feathers marked with light splotches cover the grifflet's front legs, forebody, and wings, while the creature's eagle-like head is almost completely grey. The rear half of the grifflet's body is that of a young lion, with short, pale yellow fur and a long feline tail. Even at this immature stage of life, the horse-sized grifflet is a deadly foe.
Grifflets, being a flying creature, are sometimes out of reach for melee attacks, predominantly when they have just soared into a room (though they also sometimes use it as a form of retreat).
Therefore, melee hunters should wait until the grifflet itself attempts a melee attack (either with its beak or claws) against an adventurer before advancing (they can melee attack the yeti while remaining at high altitude). Ranged weapons and magical attacks perform as usual, although many knockdown and nature type spells (for example, Tremors (909) does not affect them as they are not on the ground. Unlike the Lesser griffin and Storm griffin, Grifflets can be stunned and do not break it.
They also have various maneuver and spell style abilities which can cause roundtime, and can beat their wings for a Call Wind (912) style effect.
When using its claw attack, the grifflet attacks with two claws at once (similar to Two Weapon Combat).