ce gargantuan darvakka shadow undead 

Perception +32; greater darkvision, lifesense [object Object] feet

Skills Arcana +29, Athletics +35, Negative Energy Plane Lore +31, Religion +32, Shadow Plane Lore +31, Stealth +31

Str +10 Dex +5 Con +8 Int +5 Wis +6 Cha +6

AC  40; Fort +32, Ref +29, Will +34

HP 460, negative healing; Immunities death effects, disease, paralyzed, poison, unconscious; Weaknesses good 15, silver 15; Resistances cold 15

Entropy's Shadow (aura, divine, necromancy, negative) 60 feet. As vanyver, but DC 38 and 5d6 damage.

Sunlight Powerlessness As vanyver.

Attack of Opportunity [R] Claw only. An urveth gains 3 extra reactions each round that they can use only to make Attacks of Opportunity.

Speed 25 feet, burrow 60 feet; air walk

Melee [>] jaws +36 (magical, reach 15 feet), Damage 3d10+14 slashing plus 2d10 cold and Improved Grab

Melee [>] claw +36 (agile, magical, reach 15 feet), Damage 3d6+14 slashing plus 2d10 cold

Melee [>] stinger +36 (poison, magical, reach 20 feet), Damage 3d6+14 piercing plus 2d10 cold and urveth venom

Divine Innate Spells DC 40; 8th harm (×3); 7th eclipse burst, plane shift (to Material Plane, Negative Energy Plane, or Shadow Plane only), true seeing; 4th darkness (at will); Cantrips (9th) detect magic; Constant (9th) air walk

Frenzy [>>] The urveth makes two claw Strikes and one stinger Strike in any order.

Swallow Whole [>] Huge, 2d10+5 bludgeoning, Rupture 35. A living creature that ends its turn swallowed whole by an urveth becomes drained 1 or increases its drained condition by 1, and the urveth gains 10 temporary Hit Points. A creature whose drained condition increases to 5 in this way dies.

Urveth Venom (poison) Saving Throw DC 37 Fortitude; Maximum Duration 6 rounds; Stage 1 3d6 negative damage and 2d6 poison damage (1 round); Stage 2 3d6 negative damage, 2d6 poison damage, and enfeebled 2 (1 round); Stage 3 3d6 negative damage, 2d6 poison damage, and enfeebled 4 (1 round)

Book of the Dead, page 84.