Feast of Shadows

This dark, tattered cloak seems to shimmer with an otherworldly hunger. While wearing the Feast of Shadows, you can channel the essence of fallen foes. When you reduce a creature to 0 hit points, you can use your reaction to consume a portion of their life force, gaining temporary hit points equal to your character level. These temporary hit points last for 1 hour. The cloak also grants advantage on Stealth checks when in dim light or darkness, allowing you to blend into the shadows. Additionally, once per long rest, you can cast the spell 'Darkness' centered on yourself as an action without expending a spell slot, but you must maintain concentration on it as normal.