Leviathan
Level 23 Solo Gargantuan AC 22
600
3
Save DC 24.
Truesight, Speed of 120'.
Immunities.

Cold, Lightning, Acid, Poison, Exhaustion, Grappled, Paralyzed, Petrified, Poisoned, Prone, Restrained, Stunned and no speed restrictions of any kind and it's shape cannot be changed through any means.

After each hero’s turn, choose 1 body part stays above water until next turn.
  • Lightning Beam (eye).

    (1d20+19) A 10' wide beam of lightning shoots out of Leviathan eye doing 1d20+20 lightning damage.

  • Tentacles (body).

    (1d20+19) Leviathan makes 2 grapple attacks with it's tentacles doing 1d10+10 (acid) and the creature is restrained.

  • Fling (body).

    (DEX 24) Leviathan Flings any creature(s) it chooses up to 60' doing 1d20+19 bludgeoning damage. (Success is half damage)

  • Swallow (head+body).

    (DEX 24) Leviathan attempts to eats 1 creature doing 3d20+25 acid damage and storing it into it's mouth. Upon success the creature takes half damage and isn't swallowed.

    If it is grappled already, it get's no save. The creature takes 1d20+19 acid every turn while inside the Leviathan. You escape if you do 50 damage in one turn to the inside of it.

  • Slam (body or tail).

    (DEX 24) Leviathan slams it's body into enemies in a 35' cone eliminating that much land and doing 3d20+25 Bludgoning damage and knocking them prone) (half on save and not prone)

  • Tidal Wave (1 use) .

    (STR 24) Leviathan creates massive tidal wave 250'x250' doing 3d20+25 damage and knocking enemies back 30' and knocking them prone. No movement on save.

  • Kraken Minion (special if a creature grabs onto the leviathan while it submerges).

    1d20+15 3 Kraken tentacles swipe at a target doing 1d20 damage each. The tentacles have 20hp.

BLOODIED:

When 2 of the body parts hit 0 hp the Leviathan uses frost wave.

DC 20 WIL save 2d20 cold damage that can't be negated in any way.

On a 20+ they suffer their choice of the following conditions during their next turn: 1 turn being Frozen Stun, 1 point of Exhaustion, or go down to 0 hp. 10-19: they must choose 2. <10: Suffer all 3.

LAST STAND:

The Leviathan is dying, once 3 body parts are down to 0 HP the whole body is exposed and it can pick 2 attacks per turn and regains 1 use of Tidal Wave. Any damage done to it goes to the remaining body part.

Upon hitting 0 HP it uses Slam one final time and rams into the ice, knocking itself unconscious.