World of Warcraft - Best Covenants For Every Class

This guide is based on the power that a covenant will give to your character.  It does not take into account aesthetics, lore or anything else.  These choices are based purely on making your character more powerful.   

Some classes will have different choices based on whether you plan to focus your time on Raiding or Mythic + content. 

Death Knight

Blood Raid: Kyrian - Phial of Serenity is the key. If it gets nerfed, this choice will change.  Mythic + : Venthyr -  AoE plus Runic Power regen boosts make this the top choice right now.  Frost Raid: Kyrian - Pelagos and Shackle the Unworthy are the keys here.  Mythic +: Venthyr - Breath of Sindragosa + Swarming Mist = amazing AoE Unholy Raid: Kyrian - Pelagos and Shackle the Unworthy are the keys here.  Mythic +: Venthyr -  Swarming Mist + Epedemic

If you're playing a Death Knight your choices are straightforward.  Fortunately, all three specs have the same choices, so swapping specs isn't going to cause you pain.