Rageborn Sunder

Large elemental, chaotic evil

Armor Class 17 (natural armor)
Hit Points 300 (24d10 + 168)
Speed 40 ft.

STR	DEX	CON	INT	WIS	CHA
20 (+5)	18 (+4)	25 (+7)	15 (+2)	10 (+0)	10 (+0)

Saving Throws Str +12, Con +14
Skills Athletics +12
Condition Immunities charmed, frightened, paralyzed, stunned
Senses blindsense 60 ft., passive Perception 10
Languages Primordial, Sylvan
Challenge 21 (33,000 XP)

SPECIAL TRAITS

• Aggressive Escalation. At the start of the rageborn sunder’s turn, it gains a +1 bonus to its attack rolls and saving throw DCs. These bonuses are cumulative and increase with each subsequent turn with no maximum. Additionally, some traits and abilities are marked with “(Round #+)”, which indicates that the rageborn sunder’s escalation bonus must be at least the number indicated before it can use these abilities. The bonus resets to 0 if the rageborn sunder spends 1 minute without attacking or taking damage.
• Ancient Power. Terrain hazards within 1 mile of the rageborn sunder use its attack bonus and saving throw DC in place of their own. This begins at +12 and DC 20, then it increases according to the Aggressive Escalation trait.
• Break Magic. When attempting a saving throw or ability check against a spell or magical effect, the rageborn sunder can attempt a Strength saving throw in place of an Intelligence, Wisdom, or Charisma saving throw, or it can attempt a Strength (Athletics) ability check in place of an Intelligence, Wisdom, or Charisma ability check.
• Relentless (Round 2+). The rageborn sunder’s speed can’t be reduced by any means and it can move through any objects or structures in its way as difficult terrain, leaving a rageborn-sized hole in its wake.
• Supreme Toughness (Round 4+). The rageborn sunder gains resistance to all damage.
• Tremendous Rage (Round 6+). If the rageborn sunder hits a creature with an attack, that attack is an automatic critical hit.
• Unleashed Apocalypse (Round 8+). The rageborn sunder rolls initiative again and takes a second turn on that initiative result each round. It can now take a total of 6 legendary actions, regaining 3 spent legendary actions at the start of each of these turns, up to its new maximum of 6.

ACTIONS

• Multiattack. The rageborn sunder makes two Brutal Slam attacks and can use one of its other actions.
• Brutal Slam. Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit: 38 (6d10 + 5) bludgeoning damage, and the target is pushed up to 15 feet away from the rageborn sunder.
• Earthbind (Round 1+). The rageborn sunder strikes the ground with tremendous force, temporarily amplifying gravity. This forms a Micro-singularity hazard in an unoccupied space within 5 feet of the rageborn sunder.
• Frack the Land (Round 2+). The rageborn sunder pours magical energy into the earth, causing eruptions around it. Choose two points it can see within 120 feet, creating an Incendiary Quagmire hazard centered on each point, each occupying a 15-by-15-foot square.
• Monolith of Power (Round 5+). The rageborn sunder raises the Monolith of Power hazard from the earth, empowering its abilities. The monolith occupies a 10-by-10- foot space and is 10 feet tall, appearing in an unoccupied space within 10 feet of the rageborn sunder.
• Thunderglass Tower (Round 7+). The rageborn sunder calls forth a spire of shining glass that crackles with energy – a Thunderglass Tower hazard. It occupies a 5-by-5-foot space and is 15 feet tall, appearing in an unoccupied space within 5 feet of the rageborn sunder.
• Vortex of the End (Round 9+). The rageborn sunder creates the ultimate expression of its primal power. A 120-footradius vortex surrounds the rageborn sunder and moves when the rageborn sunder moves. Each time the rageborn sunder uses this ability, the vortex’s radius extends an additional 120 feet, and it deals an additional 14 (4d6) necrotic damage. This effect is cumulative with no upper limit.

LEGENDARY ACTIONS

The rageborn sunder can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature’s turn. The rageborn sunder regains spent legendary actions at the start of its turn.

• Charge. The rageborn sunder moves up to its speed.
• Smash. The rageborn sunder makes a single Brutal Slam attack.
• Leaping Smash (Round 3+). The rageborn sunder moves up to its speed without provoking opportunity attacks and can make a single Brutal Slam attack before, during, or after this movement.