Das Blut

The Das Blut (or The Blood) was the name given to a spell devised by the Thules to revive Adolf Hitler after his "death" in 1945. This spell could be considered as a branch of Necromancy.

Procedure
The spell itself required an object that hold the soul of deceased and a vessel which contained the deceased bloodline.

The spell also required used of advanced technology to cast, rather the conventional use of magical acts like mixing/brewing odd ingredients, spellworks, nor spell recitation. As shown in  The One You've Been Waiting For, the object that used to hold Hitler's soul, the Nazi Pocket Watch, has specifically engineered to contained it and make the spellcasting automated.

If the caster (which from not-related bloodline) wanted, they also capable to served as the deceased soul vessel rather than the original vessel by transfusing a large amount the original vessel blood that enough to severely weaken the original ones. To did this, it required an advanced blood transfusion machine that connected the caster with the original vessel.

After the vessel body prepared, the caster can placed the object that contained the soul atop their chest. After that the container will activated the mechanism to carve the vessel flesh in swastika shape and integrated with the caster heart, and another mecanism of the object will reseal the wound. After the procedure completed, the soul can take control the caster body.

Appearance

 * Season 12
 *  The One You've Been Waiting For