Chartreuse is one of the 7 Periastrons that can be used to create the Rainbow Periastron. Chartreuse is an element about defense, mainly used to keep yourself safe from various attacks. It can still do some amount of damage though.
Attack: Low
Speed: Medium
Defense: High
How to get: Pulling out the periastron near the tree where sans is. (Level 30 required)
Move 1: Rune of Protection: User summons shield with sword that lasts for about 4 seconds. Anyone who walks towards it is repelled away. Cooldown: 12 seconds. Type: Shield
Move 2: Laser Beams: User shoots beams out of periastron, lasting for about 6 seconds at full charge. Cooldown 7 seconds. Type: Bullets
Move 3: Gamma Heal: User spawns in great sword and heals everyone near them (if they are in the party). Cooldown: 10 seconds. Type: Heal

Medal used for Chartreuse
Move 4: Redirection: Whenever someone shoots you with any projectile move, you can redirect it back to them. Cooldown: 9 seconds. Type: Transformation.
Move 5: Gamma Shield: User slams sword into the ground, which cracks, and forms a huge shield around the map. It deals 400 damage if hit by the shield, and cannot be bypassed by any moves. Cooldown:100 seconds. Type: Ultimate
(WIP)