Armor Armor reduces physical damage received.

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

Mastery provides a passive bonus to your character based on your specialization. Mastery Critical Block increases your chance to block and critically block while also increasing your attack power.

Stamina increases your total health.

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. As Protection, Crit also increases your chance to Parry via Riposte.