Ham Bat

Every kill you land with this bat starts a short regeneration window. It does not stack, the timer just resets on the next kill, so the effect is a steady top-up while you are clearing a crowd rather than a burst of healing. Sweeping through trash mobs leaves you close to full without touching a potion, which matters most on the walk between arenas and during long events.

The regen also triggers on critters and townspeople, so if you are ever desperate for a heal in an empty area, a passing bunny will do.

It hits harder while any food buff is running. That is a small bump on its own, but it costs nothing to maintain given you should already be running food before a fight, and it means the bat quietly rewards the habit rather than asking you to build around it.

Pigrons are the source, and the drop rate goes up substantially in a The Constant world. That is a deliberate wink: the weapon and its description are lifted from Don't Starve, so the seed that borrows most heavily from that game hands it out more freely.