What is "deathcap"

Usage examples of "deathcap".

I gathered and stored the poisons as Chade had taught me: water hemlock, deathcap mushroom, nightshade, elderberry pith, baneberry, and heart seize.

If anything like that happened now, the comparison, the accidental creation of the image of our deathcap threat, would upset me, plunge me into some crushed state of absolute dejection, reflecting that no matter what I did, regardless of my actions and whatever good intent lay behind them, emblems of chaos and destruction dogged me.