Tomb Lord is a Spirit affinity from the Knight Revenant faction. He is often over looked despite having a really strong kit! I have checked and double checked his ratings and I stand by them, pushing him into the top 25% of legendaries in the game. He has an AOE decrease Defence and Decrease attack ability that also controls turn meter when enemies have less than 50% HP. This is a huge ability in nearly all content, Faction Wars, Arena, Spider, Fire Knight, Ice Golem and paired with an ability that can drop 4 strong poisons on all enemies he becomes a real contender for positions in your teams. Tomb Lords main weakness is his longer cooldowns on the A3 ability forcing many people to choose the epic Stag Knight in his place despite a worse overall kit.
Tomb Lord may be your sleeper OP legendary, level him and try him out!