Alien Head (Risk of Rain 2)

Not to be confused with the first game's version, Alien Head. The Alien Head is a returning Rare item in Risk of Rain 2. It functions in a similar way as its previous incarnation, with the only difference being the way it stacks.

Each Head reduces the player's ability cooldowns by 25%*.
 * MUL-T has a cooldown on only two of it's abilities (Blast Canister and Transport mode) so this item is arguably worth less for it, compared to other characters.
 * The Artificer has a cooldown in all abilities, so this item is arguably the most beneficial for it.

* Effects follow a logarithmic formula, meaning all stacks after the first become 25% of 25% (meaning 6.25% more off the cooldown per stack beyond the first)