Petrichor is a Demon Unique staff with no boss attached: it drops in Adventure Mode once you are level 67 or higher, and keeps dropping there however far you go. Every copy is item level 72, and there 0.6% of what falls comes up Unique. It is built on Attuned Conduit Staff — step 5 of the Conduit Staff line, item level 60 and up.

It always rolls the same numbers: +94 Power, +11% Cooldown Recovery, +11% Storm Damage, +15% Shock Effect, +9% Power, +27% Projectile Damage and +27% Storm Damage.

One Unique drop in 40 is a Mythical copy: the same item carrying 15–25% Mythical Energy that boosts every stat on it and can never be changed; the 15% floor is 10 times as common as the perfect 25%.

On top of that it carries Petrichor — Your Main attack applies Shock.

It leans into Shock.

Wearing it hands you Aether Beam and Overload.

“The smell of rain on stone, bottled at the moment before.”