Drowned Mummy

Creature 17
rareAmphibiousEvilLawfulMummyUndeadUnholy
Perception +30; Echolocation, Darkvision
Skills Acrobatics +30, Athletics +32, Intimidation +28, Nature +30, Stealth +30 (+32 While Underwater)
CHA +1
CON +6
DEX +5
INT +3
STR +9
WIS +7

AC 38; Fort +29, Ref +28, Will +32
HP 330 void healing
Resistances Fire 15
Speed 25 feet, Swim 40 feet

Rarely artificially created, drowned mummies are miserable, dripping undead that have adapted to exist in an aquatic environment, usually over centuries, after their tomb or lair becomes flooded.