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Astral Leviathan

CR 18.00 Outsider N Colossal
Above this brobdingnagian, whalelike creature's cavernous maw of freakish teeth, multiple eyes peer out in different directions.

An astral leviathan is an immense predator that patrols the silvery void of the Astral Plane in search of food and new experiences. Dangerous if provoked, it is intelligent enough to be reasoned with, though most visitors to that plane mistakenly believe it is just a beast. It requires only a minimal amount of physical food, as it primarily sustains itself on planar energies (particularly those radiating from natural portals to other planes) and invisible streamers of astral dust. Astral leviathans are curious about types of creatures they've never met before and places they haven't visited. Civilized inhabitants of the Astral Plane might befriend, bribe, or tame leviathans, using them as cargo vessels or navigators on journeys to remote locations. More savage races enslave them with enchantments and hooked barbs and use them for the same purpose.

An astral leviathan is approximately 70 feet long and weighs 60 tons.

STR
35
DEX
14
CON
31
INT
6
WIS
15
CHA
14
HP
310 (20d10+200); regeneration 5 (acid and fire)
AC
34, touch 4, flat-footed 32 (+2 Dex, +30 natural, –8 size)
Speed
fly 90 ft. (average)
Init
+6
Melee
bite +24 (4d6+12/19–20 plus grab), 2 slams +24 (2d8+12), tail slap +19 (4d6+6)
BAB
+20
CMB
+40 (+42 bull rush, +44 grapple)
CMD
52 (54 vs. bull rush, can't be tripped)
Fort
+24
Ref
+8
Will
+16
DR
10/adamantine

fast swallow, gulping tide, swallow whole (4d6+18 damage, AC 25, 31 hp)

Fly –6, Intimidate +22, Knowledge (planes) +21, Perception +31, Survival +22

spell-like abilities:
(CL 20th; concentration +22)

3/day-dimension door

Details
Type
Outsider
Alignment
N
Size
Colossal
Environment
any (Astral Plane)
Senses
astral locating, blindsight 180 ft., darkvision 60 ft., low-light vision; Perception +31
Languages
telepathy 30 ft.
Source
Bestiary 4