Pinkymod/Heart of the Cavern

"A roar can be heard from the caverns above..."

The Heart of the Cavern is a Pre-Hardmode fought just before the Wall of Flesh.

Summoning
The Heart of the Cavern cannot spawn on its own and can only be summoned by right-clicking the found at the bottom of the.

Phase 1

 * When the boss is summoned, it will teleport all players into an arena.
 * The arena is unmineable and the boss is in the center.
 * It acts like a celestial pillar and will spawn various Rock Critters, Rock Guardians, Gemflyers and Stone Sentries to fight you.
 * After defeating a certain amount of Rock Critters, it will summon nine stone sentries.
 * The boss will also summon Cave Writherers.

Phase 2

 * The Heart of the Cavern awakens, its one eye opens, marking the beginning of phase 2. This happens when enough rock critters are killed.
 * It begins to fire gembolts out of the asteroids orbiting it in various dazzling patterns. On top of this, the main eye itself will fire a enormous rainbow laser blast, similar to the Moon Lord once in a while.
 * As its health depletes, its damage increases and its attacks get more hectic. It also introduces several new attacks.
 * At 75%, 50% and 25% health, it will summon a group of Gem Critters to fight for it, making it immune temporarily again. You must defeat all the Stone Sentries in order to damage the Heart again. During this period, its attacks are less frequent.
 * In expert, at 50% health, it summons a Chromagickal Crystal to fight for it, which pursues the player and fires a miniature version of the Heart's rainbow laser. The crystal can be killed.

Trivia

 * The Heart of the Cavern takes inspiration from both the Ballos fight from Cave Story and the Erchius Horror from Starbound.

Bestiary Entry
Ancient cavern diety. I have read about it in my books back in the day when that was my forte. The Heart of the Cavern, known by many other names such as Rock of Plenty, Bringer of Fortune, the Cavegod, Father Illuminator and so on. If the legends are true, it was created by none other than the Moon Lord to answer the prayers of his cultists, to shower them with unlimited wealth. But you know, religious figures seeking unending wealth never ends well. A unspoken tragedy occurred, ending with the Heart being buried underground deep within the ranges of Sanchon Coast Mountain, supposedly. As for those cultists... Only one lived to pass the tale on. I wonder if the Medium knows anything of them, heh.