Golem

The Golem is a boss and always drops 1 of the 8 items (Stynger + Stynger Bolts together).

It is found inside the underground Jungle Temple, which you can access after acquiring the key from killing the new hardmode boss Plantera.

The Golem is summoned by putting Lihzahrd Power Cells into the Lihzahrd Altar. There are 3 (more?) power cells per jungle dungeon.

Once summoned, the Golem has 15000 health, and begin to attack. In his first phase, his head will spew fireballs every 2 or so seconds, while the hands extend towards you and deal damage. It will be somewhat mobile during this phase and you will be able to outrun it. At the second stage, at 7500/15000 HP, the Golem will turn its head towards you and start belching faster fireballs.

Once downed from 15k HP, the Golem will seperate, the head floating above the body. The head will become invincible and spew fireballs similar to phase 1. At this time, the body of the Golem begin to jump towards you, and have 8000 HP. It is very difficult, if not impossible, to evade the damage from the body at this phase.