That's why, when I grabbed an early review copy of Arcana Unleashed at Gen Con, I dove straight into the subclasses first. Arcana Unleashed has made it slightly better. Vestige Spells gives you some always-prepared Cleric spells, but your limited spell slots puts a cap on how useful that can be. Undead Thralls is improved from fifth edition, and it's slightly better than the version we saw in playtesting, too. Empowered Transmutation makes your non-violent Transmutation spells slightly more potent, which is nice on occasion.