Erdolliel quickly casts a spell down the hall.[sblock=DI oc]So, I'm not sure how it works in 3 dimensions, but I want to cast Black Tentacles. It has a 20ft radius spread, so if that works as a sphere, I would like to center it in a way that includes both the new side passage and the top of the pedastal where the drow is lying in wait. My map looking makes me think that should be possible. Duration is 8 rds, the text of the spell is as follows:
This spell conjures a field of rubbery black tentacles, each 10 feet long. These waving members seem to spring forth from the earth, floor, or whatever surface is underfoot—including water. They grasp and entwine around creatures that enter the area, holding them fast and crushing them with great strength.
Every creature within the area of the spell must make a grapple check, opposed by the grapple check of the tentacles. Treat the tentacles attacking a particular target as a Large creature with a base attack bonus equal to your caster level and a Strength score of 19. Thus, its grapple check modifier is equal to your caster level +8. The tentacles are immune to all types of damage.
Once the tentacles grapple an opponent, they may make a grapple check each round on your turn to deal 1d6+4 points of bludgeoning damage. The tentacles continue to crush the opponent until the spell ends or the opponent escapes.
Any creature that enters the area of the spell is immediately attacked by the tentacles. Even creatures who aren’t grappling with the tentacles may move through the area at only half normal speed. [/sblock]