Bosses (Metroid Mod)
Bosses are aggressive, resilient enemies intended to offer a substantial challenge to players. Defeating a Metroid boss is an instrumental way to obtain new materials to craft certain weapon and suit upgrades in order to progress further into the game. Each boss has its own particular way to be summoned, often involving the use of a crafted summon item. Some bosses can only be fought during night, and other only spawn once certain world conditions are met.
Pre-Hardmode bosses
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Torizo is a large purple-gray statue with 1,400 / 2,100 / 3,150 health in its head and 2,000 / 2,800 / 4,200 health in its body. It is initially summoned by approaching the Chozo Statue in the final room of the Chozo Ruins.
Torizo drops Energy Shards, which are necessary for progression through the rest of the Metroid Mod. It will also drop Chozite Ore.
After defeating Torizo once, the Chozo Ghost will appear as an NPC, and Torizo will never respawn in the Chozo Ruins. Chozo Ghost will sell an Inactive Torizo, an item that can be used to summon Torizo anywhere in the world at any time of day.
Serris is a blue, snake-like monster with 4,000 / 5,651 / 8,451 health. It is spawned by using Serris Bait in the Ocean.
Serris attacks by attempting to ram into the player at high-speeds, during which time it is invulnerable to attack. After it slows down, its head can be attacked. Once it reaches half health, it turns into a Core-X.
It drops the Serris Core X, an ingredient required to make the Speed Booster.
Hardmode Bosses
Kraid is a very tall reptilian monster with 6,000 / 8,402 / 12,603 health. It is spawned by using the Variation Matrix.
Kraid is very slow, spawning beyond the screen and slowly approaches while firing projectiles from its claws and its body. It can only be damaged from its head, and takes reduced damage while its mouth is closed.
It drops the Kraid Tissue and Unknown Plasma Beam, which are used to craft the True Varia Suit addon and either of the two Plasma beams respectively.
Phantoon is a giant alien ghost with 15,000 health. It is spawned by using the Ectoplasmic Locator at night.
Phantoon will phase in and out of visibility, alternating invulnerability between attacks, using blue phantom eye projectiles combined with ramming. It can only be damaged when its eye is open.
It drops the Gravity Flare, a component of the Gravity Suit addon.
The Omega Pirate is a large phazon-infused Space Pirate with 20,000 health. It is spawned by using the Phazon Reactor Core.
It attacks with a variety of weapon systems, including an energy siphon that absorbs blasts from the Arm Cannon. The Omega Pirate is invulnerable until its shields are down, at which point it will become invisible except when it is refueling its Phazon, which is the only time it can be truly damaged.
It drops the Pure Phazon which is needed to make the Phazon Suit.
Nightmare is a biomechanical lifeform with 30,000 health. It is spawned by using the Strange Device at night.
Nightmare attacks by shooting projectiles, but its most imposing ability is it's ability to inflict Amplified Gravity, making it much harder to dodge.
It drops the Nightmare Core X and Nightmare Core X Fragments, which are used to craft the True Gravity Suit addon.
Golden Torizo is a golden statue with 35,000 / 49,000 / 73,500 health. It has similar attacks to its pre-Hardmode counterpart, with the addition of a new attack where it jumps at the player with a damaging electric move.
It drops the Screw Attack, a powerful offensive accessory.
After it is defeated for the first time, Chozo Ghost will sell Golden Torizo Summon to allow re-summoning.