Wizard's Hat Agaric is an ingredient in Divinity: Original Sin II.
"Just like a wizard's hat, this mushroom can hold more within it than meets the untrained eye."
Wizard's Hat Agaric is an ingredient that is not used in any known recipes. You can eat it to gain 1 memory for two turns. You can also use a poison source on Wizard's Hat Agaric to add a small amount of poison damage to it. This appears to cancel out the memory bonus for undead characters, although non-undead characters will still receive it upon consuming the poisoned version.