Sans is a spec that can be created by using a Bone on Standless. It is based of the game Undertale, in which Sans can be the final boss, or just a regular character depending on what route you take. It has a wide range of evolutions.
LMB - Bone Throw: Throw a blue, orange, or white bone where your mouse points (10 damage per frame that bone is in contact with victim)
E - Bone Barrage: You throw a bunch of assorted blue, orange, and white bones all doing the same damage (10 per frame bone is in contact with victim)
R - Telekinesis: Hover mouse over someone then press R to launch them in a random direction (including straight upwards) does damage (21.4 damage)
T - Gaster Blaster: Fire a Gaster Blaster where the mouse is pointing (80 damage)
Y - Bone Floor: Raise up a filled in square of white bones from the floor where your mouse is pointing (80 damage)
F - Big Gaster Blaster: Fire a big Gaster Blaster where your mouse is pointing, only benefit is bigger hitbox (80 damage)
H - Triple Gaster Blaster: Fire 3 Gaster Blasters where your mouse is pointing (80 damage (single hit))
C - Teleport: Basic teleport, but no cooldown
B - Big Bone Throw: Throw a big bone horizontally where your mouse points (80 damage)
N - Quote: You say a sans quote but the quote isn't finished and only says "Quote"
Delta Bone = Sans = Delta Sans
(will add more)