It's spellcasting ability is its Charisma (spell save DC 20, +12 to hit with spell attacks). The hellstar is a 20th-level spellcaster. Creatures and objects that start their turn in the hellstar's bright light take 5 (1d10) fire damage and 5 (1d10) necrotic damage. The hellstar sheds bright light in a 120-foot radius and dim light for an additional 120 feet. Whenever the hellstar is subjected to lightning or fire damage, it takes no damage and instead regains a number of hit points equal to the lightning or fire damage dealt. The first time it enters a creature's space on a turn, that creature takes 5 (1d10) fire damage and 5 (1d10) lightning damage and catches fire, until someone takes an action to douse the fire, the creature takes 5 (1d10) fire damage at the start of each of its turns. In addition, the elemental can enter a hostile creature's space and stop there. A creature that touches the hellstar or hits it with a melee attack while within 5 feet of it takes 5 (1d10) fire damage and 5 (1d10) lightning damage. The hellstar can move through a space as narrow as 5 feet wide without squeezing. The hellstar has advantage on saving throws against spells and other magical effects. All creatures within 1,000 feet of the hellstar must make a DC 21 Dexterity saving throw, taking 27 (5d10) fire damage and 27 (5d10) lightning damage on a failed save, or half as much on a successful one. When the hellstar is reduced to 0 hit points, it immediately perishes in a massive explosion.

Senses darkvision 60 ft., passive Perception 17ĭeath Throes. Damage Resistances bludgeoning, piercing, and slashing from nonmagical attacksĭamage Immunities fire, lightning, poisonĬondition Immunities exhaustion, grappled, paralyzed, petrified, poisoned, prone, restrained, unconscious

D&d hellfire engine