ne huge mindless undead zombie 

Perception +17; darkvision

Skills Athletics +24

Str +7 Dex +0 Con +5 Int -5 Wis +2 Cha -3

Slow As zombie snake.

AC  27; Fort +22, Ref +15, Will +19

HP 290, negative healing; Immunities death effects, disease, mental, paralyzed, poison, unconscious; Weaknesses positive 10, slashing 10

Severed Trunk When the zombie mammoth is hit by a critical hit that deals slashing damage, the mammoth's trunk is severed from its body. Any creature grabbed or restrained with the trunk is released, and the mammoth loses its trunk

Strike and Greater Constrict. The trunk slithers across the battlefield, still animated, and acts in initiative right after the mammoth. It retains Greater Constrict and trunk Strikes but can't use tusk Strikes, foot

{@action Strike||Strikes}, or Shambling Trample. It has all the stats of the mammoth, except its AC is reduced to 23, it has only 50 Hit Points, and its Speed is 10 feet. Damage dealt to the severed trunk has no effect on the zombie mammoth.

Speed 45 feet

Melee [>] tusk +24 (reach 15 feet), Damage 3d10+13 piercing

Melee [>] trunk +24 (reach 15 feet), Damage 2d10+7 bludgeoning plus

Melee [>] foot +24 (reach 10 feet), Damage 2d10+13 bludgeoning

Improved Grab (page 213)

Greater Constrict [>] 2d10+7 bludgeoning, DC 30

Shambling Trample [>>] As Trample, Large or smaller, foot, DC 30 but the zombie mammoth Strides up to its Speed instead of double.

Book of the Dead, page 173.