Evard's black tentacles

Desecrate is a conjuration spell that conjures tentacles to grapple opponents. It was presumably developed by Evard.

Effect
This spell conjures many rubbery black tentacles. These waving members seem to spring forth from the earth, floor, or whatever surface is underfoot - including water. There are 1d4 such tentacles, plus one per caster level, appearing randomly scattered about the area. Each tent acle is 10 feet long (Large) and saves as you do. It has AC 16, 1 hit point/per caster level, an attack bonus of +1/per caster level, and a Strength score of 19 (+4 bonus). It is immune to spells that don’t cause damage (other than disintegrate).

Each round that a tentacle is not already grappling someone or something, starting the round after it appears, it makes a grapple attack at a random creature or object within 10 feet of it. These attacks take place on your turn. The tentacles do not attack each other, nor do they attack objects that are smaller than a Medium-size creature. The attacks are like regular grappling attacks, except that they don’t provoke attacks of opportunity from opponents. Also, they cause 1d6 points of normal damage (+4 for Strength), not subdual damage. A tentacle maintains its grapple even after its subject is dying or dead.

The DM can place each tentacle randomly by rolling 1d12 for direction (like the numbers on the face of a clock) and 1d3x5 feet for distance from the central point. Alternatively, the DM can just disperse them more or less evenly across the affected area.

Material Component
A piece of tentacle from a giant octopus or a giant squid.