Ouranite, Artifact
Occasionally seen as a white wisp of light floating through ancient battlefields and forgotten graveyards. It is conjectured to be the remaining will and memory of a particularly strong individual or creature that still has attachments to this world. It is reported to smell like dust and causes fear when touched. When refined, it takes on a charcoal black color with white streaks and it begins to sigh almost imperceptibly at midnight. It is considered highly disrespectful to harvest and refine it.
Armor – Once per day when you fall to 0 hit points, instead of falling prone you may instead choose to regain your maximum hit points. If you do, after 5 minutes you must succeed on a DC 23 constitution saving throw or die. This ability recharges every night at dusk, or when you die.
Weapon – Twice per day, as an action, you may summon an undead of CR 4 or lower to fight by your side. This ability recharges every night at dusk.
Other – Once per day, as an action, you may summon two Ghouls to aid you in combat. You may command these wights with a bonus action. This ability recharges every night at dusk.