PvE Tank DK build:
Every Content easily tankable

Frost Staff for easier tanking and Minor Breach
Lightning Staff for Off-Balance

Sets:

Armor:
Sturdy Medium Helm Bloodspawn - Prismatic Defense Glyph
Sturdy Light Shoulder Bloodspawn - Health Glyph
rest heavy armor
Reinforced Chest Claw of Yolnahkrin - Prismatic Defense Glyph
Reinforced Pants Claw of Yolnahkrin - Health Glyph
Sturdy Sash Claw of Yolnahkrin - Health Glyph
Sturdy Arms Claw of Yolnahkrin - Health Glyph
Sturdy Shoes Claw of Yolnahkrin - Health Glyph

Weapons:
Infused One Handed (front bar) Puncturing Remedy - Weakening Glyph
Sturdy Shield (front bar) Puncturing Remedy - Health Glyph
Infused Frost-Staff (back bar) Powerful Assault - Crusher Glyph

Jewelry:
Infused Necklace Powerful Assault - Magicka Regeneration Glyph
Infused Ring Powerful Assault- Block Cost Reduction Glyph
Infused Ring Powerful Assault - Block Cost Reduction Glyph

Alternative Sets:
Lady Thorn, Tremorscale, Earthgore, Shadowrend, Swarm Mother, Symphony of Blades

Aegis of Galenwe, Torug's Pact, Ebon Armory, Arkasis’s Genius, Alkosh, Eternal Vigor, Crest of Cyrodiil

Alternative Skills (playing around with some skills makes you immortal for every content):
Choking Talons - Minor Maim and snare
Deep Breath - Aoe interrupt
Crushing Shock - ranged interrupt
Elemental Drain - support for mag chars
Replenishing Barrier - shield your team
Efficient Purge - clean debuffs
Stalwart guard - guard one teammate
Balance - sustain
hardened armor - Major Resolve and Major Ward without Balance debuff
Sanguine Altar - heal, synergy
Energy Orb - support team with sustain/heal
Time Freeze - aoe stun
Elemental Wall - glyph/minor breach trigger
Stone Giant - buff group damage


Bufffood/Potions:
Bewitched Sugar Skulls
Tri-Stat Potion (called Essence of Health: Health, Stamina, Magicka)