Magic:Evards Black Tentacles

Conjuration (Creation)
Level: Sor/Wiz 4
Innate Level: 4
Component(s): V, S
Casting Time: 1 action
Range: Medium
Target: Large, 1d4 tentacles, +1/level (max 20)
Duration: 1 round/level
Counter(s): --
Saving Throw: Fortitude special
Spell Resistance: No
Metamagic: Empower, Extend, Maximize, Quicken, Silent, Still
Energy Substitution: No

A field of thick, rubbery tentacles rises from the ground. For every round that a creature is caught within the area of effect, it suffers attacks from 1d4 tentacles, each capable of doing 1d6+4 points bludgeoning damage. If any tentacle attack hits a target, that target must then make a Fortitude saving throw or become paralyzed.

NB. Changed damage dealing to be sequential rather than all at once