Blood Death Knight Tank Gems, Enchants, and Consumables — The War Within (11.0.5)

You should use a Culminating Blasphemite in your first available gem socket, and fill every other with Versatile Ruby.

In practice, these guidelines are largely down to how enchants do not compete over primary stats, merely secondaries. As a result, the gearing stat priority is applicable and can be simply followed: Versatility as a good default, or whatever sims the highest for you at the time for damage. You can find more information about this on the stats page of this guide.

Use Flask of Alchemical Chaos as a general-use phial. If you prefer to have a simpler flask that provides a single secondary stat Flask of Tempered Aggression or Flask of Tempered Versatility can be used instead.

If you are actively pushing Mythic+ keys and gold is no issue to you, it is possible to gain a significant amount of value on specific encounters by swapping phials mid-run. If you intend to do so, you should plan your swaps ahead. You can leverage the following phials:

• Phial of Icy Preservation when dealing with encounters with predictable, large, one-hit tankbusters. This phial applies to the entire hit if you had the right debuff at the time of the hit - be above 50% when the tankbuster lands and you will gain 6% damage reduction on it. It is the only old-expansion Phial worth considering, and also allows you to use Tempered Potion and gain the value of the flask you were missing during it.
• Otherwise, use Flask of Alchemical Chaos.

Algari Mana Oil as a safe defensive and offensive option. For raw damage, you should sim between Algari Mana Oil and Ironclaw Whetstone / Ironclaw Weightstone.

Potion of Unwavering Focus should be your combat potion of choice on pure single target. For anything else, you should instead use a Tempered Potion (with Flask of Alchemical Chaos).

You should use Algari Healing Potion for in-combat healing. Healing potions do not share a cooldown with Healthstones, so you can use both independently if you can access a Warlock.

Use The Sushi Special / Everything Stew as your food buff of choice if a Feast is not available.

If a Feast of the Midnight Masquerade / Feast of the Divine Day is available, use this instead.

In addition, if you can afford it, you should use Draconic Augment Runes to increase your primary stat. Since there is a finite amount of the consumable runes available, you should make sure to use them wisely and to stock up on them for when you need them.

Through the Patch 10.2 Emerald Dream Zone and its Dream Wardens Faction, you can also obtain the Dreambound Augment Rune, which is permanent!