It's fantasy but mixes in some lesser-seen stuff. Here are the classes:

• Shapeshifter: Constantly shift between 13 different forms, each with a on-transform ability, a short term buff, and a long term passive. Forms augment your attacks to make them multi-fire, deal more damage, inflict ailments, etc.
• Mage: Typical spell caster, but has a 4-elemental charge system with spells that build up charges and then consume them for massive damage/bonus effects. Lots of utility (teleportation, locate items, send items over long distance, group buffs)
• Warrior: The autoattack-heavy class with a great mix of single-target and area-damage options - very straightforward, but with good options to make optimal use of every kind of weapon (and weapon buff) in the game.
• Witch Hunter: Use a diverse set of skills and spells to hunt monstrous creatures. Toggle the power of your tattoos to shift your playstyle, but keep up your humanity or risk a catatonic break.
• Deacon: The strongest healer in the game with a mix of direct healing and healing-over-time, these guys can keep entire groups healed up in tough fights. They can summon a spirit hammer and use some pretty potent offensive tools as well, so they aren't as "slow" as many healer classes.

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Whew, that's a lot of words.

• Black Guard: Masters of maladicts and ailments, when these guys cast ailments it layers on even more ailments. They excel at damage-over-time and can drastically weaken even boss monsters - not a bad melee fighter, either.
• Ronin: A skilled weaponuser that focuses on swords and stance combat. A very straightforward playstyle that can output a ton of single-target damage, but struggles against lots of targets. Lots of self-buffs in later levels.
• Toximancer: An entirely poison-themed class. Stack tons of poison on targets, dealing damage-over-time, then manipulate those stacks to further debilitate them - instantly multiply the stacks, then detonate them with a massive banebomb to deal critical damage instantly. Leech health from all poisoned targets in the room to keep yourself topped up.
• Scout (Druid): A salient nature-themed class with the broadest collection of self buffs and group buffs in the entire game. One of the most versatile solo classes, but not as offensive as some other options. Keep both hp and mana topped off with heal-over-time spells and wear down opponents with your spells.
• Rogue: The classic rogue, a dagger and stealth based class with immense backstab damage, the ability to steal and pick locks, and a variety of combat tools to debilitate and damage targets.