Acrid

Acrid is a playable character in Risk of Rain 2.

How to Unlock
Under the Bazaar in the Bazaar Between Time there is a hidden cave that leads to a purple portal. This portal leads to the Void Fields. Beating the nine challenge cells in the Void Fields will unlock Acrid.

Tips

 * Acrid's Vicious Wounds attack animation can be cancelled and reset by initiating a dash. This allows Acrid to attack extremely quickly with no items. In Development Thoughts #11 it was noted this behavior will likely get removed.
 * Acrid's Poison can't kill on its own.
 * This makes items such as rocket launchers, drones, and any other on hits incredibly good.
 * Poison can kill elites if it brings them within the required threshold for Old Guilllotine.
 * Poisoning the boss or bosses via Neurotoxin and Epidemic and then running away is a great tactic as it will tick for the same damage while you're running.
 * Acrid's Epidemic gives him great early-game AOE damage. When combined with items such as the Ukulele, Will-o'-the-wisp, and Gasoline, this lets him easily clear crowds of enemies.

Trivia

 * The challenge necessary to unlock Acrid, "...To be left alone" is a reference to Acrid's victory screen from the first Risk of Rain, which reads "...And so it left, with a new hunger: to be left alone."