Lore
Shades are shy gostly entities, generally choosing to remain hidden from other non-ghostly entities. 
Abilities
The Shade is an Origin with the following abilities:
Invisibility [Primary]
Shades have the ability to turn their entire bodies, including any armour they are wearing, entirely invisible. The invisibility is counteracted by the glowing effect and expends some ectoplasm.
Ectoplasm
Ectoplasm is the life essence of any ghostly creature, without it, they will slowly start to die.
Luminophobia
Light gradually decreases the amount of ectoplasm that you have, which causes you to take damage if it gets too low.
Translucent Skin
Your skin is slightly translucent, allowing others to see through you.
Phasing [Secondary]
Ghosts have the ability to phase through blocks, this is because they are incorporeal. toggleable.
Undead
Spirits are undead, meaning that health and poison potion effects are swapped and cannot drown.
Night Vision
A ghost likes the darkness, so they're able to see in the dark.