Alchemist

The Alchemist has abandoned his pursuits to transform metals into gold and instead brews malignant concoctions to destroy his enemies. Hurling flasks of acid, the Alchemist spreads a deadly poison on anyone who crosses him.

Forgoing mines for grenades, he is able to use different grenades for different effects, ensuring that his mere presence dissuades enemies from clustering. Use the Alchemist when you have other fire damage dealers on the squad, as his debuff helps maximize their damage.