Thessala Hydra

Item	Chance	Quantity
Theradric Crystal Carving Quest item	≈ 80%
Seaweed	≈ 59%	1–2
Big-mouth Clam	≈ 34%
Fine Sand	≈ 27%	1–2
Raw Spotted Yellowtail	≈ 9.1%	1–2
Reinforced Steel Lockbox	≈ 1.5%
Aquamarine	≈ 0.36%
Star Ruby	≈ 0.33%
Plans: Wicked Mithril Blade	≈ 0.13%
Pattern: Red Mageweave Headband	≈ 0.08%
Pattern: Big Voodoo Cloak	≈ 0.06%
Pattern: Big Voodoo Pants	≈ 0.06%
Recipe: Limited Invulnerability Potion	≈ 0.06%

Drops and chances are estimates; not all have been confirmed in the current game. 378 rarer world drops are not listed.

Skinning

Item	Chance	Quantity
Thick Leather	≈ 68%	1–2
Rugged Leather	≈ 27%	1–2
Thick Hide	≈ 4.9%