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The "Auto-killer" is a mechanism added by the modification of the GravityExpansion project GravityCraft exclusive mod add-on DraconicEvolution, which allows you to extract resources from spawners without having to kill mobs and build separate ones for this structures.
Getting
You can create or buy in the in-game store by pressing F4.
Usage
The auto-killer works with a stabilized spawner from the mod DraconicEvolution, an electric spawner from the mod EnderIO and regular spawners from Minecraft.
To start producing resources from mobs, you need to install a spawner with a mob from any convenient side of the Auto-killer. Up to 6 spawners can be installed around one Auto-killer. But keep in mind that if six spawners are installed, there will be no direct access to the Auto-killer and one of the parties will need to be released.
To pump out experience, you need to connect liquid pipes to one of the sides of the Auto-killer, and to collect resources, install a chest, object pipes, or a ME interface from the mod applicedenergistics 2 into which the Auto-killer will automatically feed items from the internal inventory.
It is worth noting that the Auto-killer also supports enchantments, but each one must be installed as one book with one type of enchantment.

Supported types of enchantments
- Reaper (Increases the chances of getting a mob soul from the Draconic Evolution mod)
- Sharpness (Accelerates the speed of the Auto-killer)
- Fire Spell (Immediately processes resources as if they had already been processed in the oven)
- Mining (Increases the amount of extracted resources)
There is also a car killer video guide
See also