DK Vamp Tank build - Dragonknight PvE - ESO

Runic sunder: distance taunt, armor stealing
cruxweaver armor:: applies minor breach, generates crux
Runeguard of still waters: Minor protection, minor resolve, enemy immobilization, self healing when consumed
 Impervious Runeward: Large initial shield, healing with crux consumption, damages enemies
Blood mist: Dash forward, self heal with magic damage.

Sanguine altar: This applies the healing needed for your group to benefit from sluthrug's which causes enemies to take more and deal less damage. Keep this up. This also allows for the proc on Lady Thorn's monster set, applying major maim and dealing damage.

Razor Caltrops: DoT, movement reduction, and major breach applied. 
Extended ritual: AOE HoT, and group cleansing
Repentance: Minor Fortitude, endurance, and intellect with healing and stam regen.

Aggressive Horn: Max mag/stam increase by 10%, major force. With the dk passive: restores your resources.
Sanctum of the Abyssal Sea: your uh-oh button that applies a huge shield, and with the DK passives: Restores resources.

Keep up Sanguine altar, caltrops, and your defensives. 
Use your shield as needed
Use still waters for crowd control
Use mist for passive healing alongside extended ritual. Only use extended ritual as needed for the group, or self cleansing.
Top off your stam and health with repentance as needed.