Most summoning items need to be used at night, which starts at 7:30PM. Day begins at 4:30AM, when many bosses will despawn. The few exceptions are noted below. It is possible to summon more than one boss at once, but not the same boss. Boss: King Slime Summoning Item: Slime Crown...
Materials Drops Ores, Bars and Gems Other SummoningBossGrand Flare Gun(Storm Flare) •Jellyfish Resonator•Unstable Core•Ancient Blade•Star Caller•Strider's Tear•Void Lens•Grim Harvest Sigil•Aromatic Bulb•Abyssal Shadow•Doom Sayer's Coin ...