Scarabeus is an armored Antlion Charger-like bug that runs after you, tries to jump on you, and summons Scarabs to attack you. It has 1,500 health (2,250 in Expert Mode). It can be summoned with a Scarab Idol anywhere, at any time.
The Vinewrath Bane is a large flower-like boss with spiky arms. It fires nature-like projectiles at the player. It has 3,200 health (5,440 in Expert Mode) in its first phase, and 2,100 health (3,360 in Expert Mode) in its second phase. It can be summoned with a Bramble Tooth in the Reach biome, at daytime.
The Ancient Flier is a large flying enemy made of bones that flies above the player and fires projectiles at the player, and occasionally summons Bone Harpies to also attack the player. It has 2,800 health (5,600 in Expert Mode). It can be summoned with a Jewel Crown anywhere, at any time.
Starplate Raider
The Starplate Raider is a long worm boss that fires electricity-themed projectiles at the player. It has 6,700 health (8,040 in Expert Mode). It can be summoned with a Starplate Beacon anywhere, at night.
Infernon is a large, hellish flying enemy that floats above the player and fires projectiles. He has a summon (Infernus Skull) that can aid in killing the player. He has 13,000 health (26,000 in Expert Mode). He can be summoned with a Pain Caller in the Underworld at any time.
Dusking is a big, purple floating head that moves towards the player while flinging many projectiles at them, including a minion, the Shadowflamer. He has 21,000 health (42,000 in Expert Mode). He can be summoned with a Dusk Crown anywhere, at night.
The Ethereal Umbra is a tiny floating orb of light with multiple phases. It has 4,100 health (5,329 in Expert Mode). It can be summoned with an Eerie Wisp in the Spirit Biome, at night.
Illuminant Master
The Illuminant Master is an armored, hooded being that attacks the player with lasers and other projectiles. They have 32,000 health (64,000 in Expert Mode). They can be summoned with a Chaos Fire anywhere, at night.
Atlas is a massive boss made of stone that floats around, shooting projectiles and summoning Cobbled Eyes as its health depletes. It has 41,000 health (69,700 in Expert Mode). It can be summoned with a Stone Fist anywhere, at any time.
Post-Moon Lord
Overseer
The Overseer is a rocky being that charges at the player, teleports, and fires projectiles at the player. It is the final boss of the Spirit Mod, as of currently. It has 179,000 health (358,000 in Expert Mode). It can be summoned with a Spirit Idol in the Spirit Biome, at night.