Haste increases attack and spell casting speed, adds additional damage and healing to DoTs and HoTs, and reduces the GCD.

Agility increases your attack power and the damage dealt by your abilities.

Mastery provides a passive bonus to your character based on your specialization. Mastery Enhanced Elements increases your chance to activate Stormbringer and Windfury while increasing all Fire, Frost, and Nature damage dealt.

Versatility increases your damage, healing, and absorption done and decreases damage received.

Critical Strike increase the chance for your spells and attacks to critically hit for additional damage and healing.