Hi and welcome to this post Day of the Dead Lichborne. I'm filling in for Daniel this week to talk about my personal favorite death knight talent spec, namely blood. Blood! Over the past year blood has seen its ups and downs, often lagging behind frost for tanking and unholy for DPS (and at times vice versa) but as of patch 3.2 blood seems to be in a really good place, overall. Strong for soloing/questing as well as instancing as either a tank or DPS spec, blood can stand shoulder to shoulder with the other DK talent specs.
Blood's reputation was formed in the early days of Wrath of the Lich King as one of the absolute best leveling specs due to its very strong self healing options. While these were toned down from their beta and early release heights, the tree is still the strongest at creating opportunities to regenerate health of the three, and is often used by enterprising DK's looking to solo older content. But it's capable of far more than that, and of the three specs it's the most physical damage based tree with Heart Strike being purely weapon based damage. Furthermore, blood DK's have one of the nicest pure physical DPS buff abilities in the game with Hysteria. You can be selfish with it and save it for yourself, as you're almost sure to make back the health you'll lose to the talent, but if you choose to share it with a DPS warrior or cat feral druid, the raw DPS they can put out (especially druids) can be rather crazy.
So let us talk about blood. Blood is life... and in your hands, it can also be death.