Guardian Golem

Type	Light pet
Use time	20 (Very fast)
Tooltip	Summons a toy golem to light your way; 'Power cells not included.'
Rarity
Sell	5 GC
Research	1 required
Buff	Toy Golem(Desktop, Console and Mobile versions)
Buff tooltip	Got myself a crying, talking, sleeping, walking, living idol!
Use	https://terraria.wiki.gg/wiki/File:Item_2.wav

Desktop/Console/Mobile-Only Content: This information applies only to the Desktop, Console, and Mobile versions of Terraria.

Master Mode-Only Content: This information applies only to Master Mode and Master Mode worlds.

The Toy Golem flying.

The Guardian Golem is a Hardmode, post-Golem light pet-summoning item that spawns a Toy Golem light pet upon being used or equipped. When the player is far enough away or in midair, the Toy Golem emits a rocket exhaust to catch up to them. The Guardian Golem has a 1/4 (25%) chance of being dropped by Golem in Master Mode.

Trivia

The phrase in the Guardian Golem's tooltip,"'Power cells not included.'", is a nod to how most battery-powered toys in commercials and advertisements state a similar warning for "batteries not included", and alludes to how Golem is summoned with Lihzahrd Power Cells.
The buff's tooltip is a reference to the song "Living Doll" written by Lionel Bart for Cliff Richard and The Shadows (then still known as "the Drifters") in 1959. The original lyrics were: "Got myself a cryin', talkin', sleepin', walkin', livin' doll". The tooltip simply replaces "doll" with "idol", as Golem is the Lihzahrdian Idol.
When summoned, the Toy Golem will always attempt to position itself in front of the player. This is likely because it is meant to act as a guardian, hence the name of the item.