There are two major new bosses in the Terraria 1.4 update: Queen Slime and Empress of Light. here is the guide on how to find one of the them, Queen Slime.
How to Find the New Boss Queen Slime?
The Queen Slime is a Hardmode Hallow-themed boss summoned with the Gelatin Crystal. While Queen Slime is alive, her exclusive music Queen Slime will play.
How to Spawn Queen Slime
Queen Slime can be spawned by using a Gelatin Crystal. This can be done in the Hallow at any time.
Gelatin Crystal can be found Underground Hallowed mixed with Crystal Shards.
The Gelatin Crystals appear to change color from pink to blue.
Credit to Wiki
You can also watch this video guide on how to summon Queen Slime in Terraria 1.4.
Terraria is out now on PC, PS3, Xbox 360, iOS, PS Vita, PS4, Xbox One, 3DS, and Switch.
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