The Sea Shambler is a servant of the goddess Elancil. It is an elemental type creature that is brought about by a ritual conjuration at the sea’s shore that brings forth the raw materials and spirit of a drowned being to inhabit it.
Source: Conjure Woodland Beings:
Movement: 30′ swimming / 30′ walking
Armor Class: 14
HD/HP: 8D8/36
Alignment: Chaotic Evil
Combat: Multi-Attack: It attacks 3 times per round with 2 claws (@ +5; 2d6/7) and a tendril (@ +5; 3d6/10). It has 2 tendrils, one is used to stabilize it. A tendril is 10′ long, AC: 13 and can take 30 damage before being cut off.
Acid Spray (Recover 1-3 on d6) 10′, 15′ wide; @ +5; 6 + d6/9 damage (instead of tendril)
As long as it has 1 tendril free, it suffers no movement penalty over difficult terrain.
Brine Burn: Any wound = Constitution DC 10 check or Necrotic (D4/2 and 1 level exhaustion until long rest)