This spell does not have a direct equivalent in vanilla.
Summon Shambling Mound
Duration: 8 hours
Casting Time: 1 round
Area of Effect: Special
Saving Throw: None
This spell summons forth a shambling mound to assist the caster. The shambler appears to be heaps of rotting vegetation, but it is actually an intelligent form of plant life, with a roughly humanoid shape, and a brain-like control center in its “chest” area. The shambling mound will remain under the caster’s control until it is slain or the spell duration expires.
Shambling Mound (16 Hit Dice):
STR 19, DEX 10, CON 16, INT 7, WIS 10, CHA 9; AL Neutral
HP 124, AC 0, THAC0 2, Saving Throws 4/6/5/4/7
2 Attacks Per Round, 2d6+10 Crushing Damage (Fist +3)
Entangle: 50% chance target must save vs. breath or be entangled
Constrict: any creature entangled by the shambler can save vs. breath each round to break free; those who fail the save suffer 2d6+10 points of damage and remain entangled
Immune to charm, hold, poison, polymorph, sleep, & stun effects
Electrical Resistance 125%; Fire Resistance 100%; Cold Resistance 50%
Crushing Resistance 100%; Slashing, Piercing, & Missile Resistance 50%