Fatal Error Sans stays in a glitching void he mostly uses red strings bones and Gaster Blasters to attack as the red strings could easily go and rib through bones. He talks in a low tone and the letters can be multiplied especally the first and the last. Fatal Error Sans can copy codes by only touching and can make it under a second just by touching. He can easily teleport above anyone he can't leave the void so he teleports them there to be their prey and tool. He can't die but he can pass out.