Gensokyo/Eternity Larva

"Let's fight to see who summer belongs to!" Eternity Larva is a Tier 1 Pre-Hardmode boss.

Spawn
Eternity Larva does not spawn naturally. Instead, she can be summoned by using a Yellow Swallowtail Butterfly during the day.

Behavior
Eternity Larva alternates between a movement phase and an attack phase. In her attack phase, she attacks using one of three spellcards, depending on her remaining health:
 * Scale Sign "Scattering Scales" Eternity shoots salvos of butterfly scales in multiple directions, while occasionally shooting a slow-moving blue orbs downwards.
 * Butterfly Sign "Butterfly Dream": Butterflies move outwards from Eternity's position, forming a circle.
 * Butterfly Sign "Fluttering Summer": Eternity shoots a pattern of butterfly scales, aimed at a single player. During its lifetime, the scales change their direction multiple times. Large red bullets are also fired directly at the targeted player.

Trivia

 * While Eternity Larva is alive, 'A Midsummer Fairy's Dream', her theme from Hidden Star in Four Seasons, will play.
 * If the Gensokyo Music Mod is not installed, Boss 2 will play instead.