Void Gaster

This version of Gaster is a Mythical soul. His moveset is based off his attacks from when he was in the void. No chroma hands included.

Level 1: Void Spike.
Summons a trail of black spikes.

Level 5: Void Teleport.
A typical teleport.

Level 10: Void Eruption Spike.
Basically sans bone zone, but spikes are larger.

Level 15: Void Blaster.
Void Gaster's version of Sans Gaster Blaster.

Level 20: Void Strike.
Summons a circle, and anyone in it will get impaled. Good for combos.

Gaster Trade.
Get Void Gaster to level 100, with 250 love, then go to the true lab in Alphys Lab. Click on the DT Extractor (the big goat skull). And when sucessfully done, you'll have Gaster at Level 15. ( Or higher level if you have more level than level 100. )