Plague Infusion

In the Blood Death Knight talent tree, Plague Infusion sits in the Blood specialization talents, row 8 of 11. It is a single-point node. Its row opens once 20 points are spent in Blood Talents.

Connected above

The tree draws a line into Plague Infusion from Boiling Point and Lifeblood.

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  Boiling Point

  Heart Strike has a chance to make your next Blood Boil empowered, dealing 50% increased damage and echoing after 3 sec.

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  Lifeblood

  Death Strike heals for an additional 20% of its healing over 5 sec.

Connected below

Plague Infusion leads on to Blood Mist.

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  Blood Mist

  When you cast Dancing Rune Weapon, you become enveloped in a blood mist that surrounds you for 8 sec, increasing your Parry by 5%. Deals (64% of Attack Power) Shadow damage every 1 sec to enemies. Every time it deals damage you gain 2 Runic Power, up to a maximum of 10 Runic Power. Deals reduced damage beyond 8 targets.

Same row

Also on this row: Bloody Reflection, Iron Heart, Bloodied Blade and Coagulopathy.

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  Bloody Reflection

  While Blood Shield is active, taking direct damage reflects (110% of Attack Power) Shadow damage back to the attacker. Blood Shield can now absorb up to 65% of your maximum health.

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  Iron Heart

  Blood Shield's duration is increased by 2 sec and it absorbs 20% more damage.

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  Bloodied Blade
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  Coagulopathy