Blood Magic

For the support gem previously named Blood Magic Support, see Arrogance Support. For the other support gem with related effects, see Lifetap Support.

Blood Magic (often referred to as BM) is a keystone passive skill that allows the character to spend life instead of mana to use skills. It also sets maximum mana to zero.

Mechanics

If taken with Eldritch Battery, your energy shield will continue to protect mana but will not be spent.

Skills that reserve mana will reserve life. The cost of skills is calculated normally, so reduced mana cost or reduced mana reservation modifiers will reduce the amount of life used. It is not possible to commit suicide through Blood Magic.

While you have Blood Magic, you are neither at full mana, nor low mana.

Location

Blood Magic is located in the bottom left corner of the tree. Taking Blood Magic is required to reach the two 10% life nodes and the keystone passive skill, Mortal Conviction.

Class	Distance from start
Marauder	12
Duelist	12
Templar	14
Scion	16
Ranger	19
Witch	21
Shadow	26

Related unique items

These unique items have the Blood Magic modifier, which provides the same effect as this keystone. Taking the keystone in addition to equipping one of these items will impart no additional benefit.

Version history

Version	Changes
3.14.0	(Undocumented) The mod Socketed gems have Blood Magic has been removed from the game and replaced by Socketed Gems Cost and Reserve Life instead of Mana, or Socketed Gems Reserve Life instead of Mana, or Socketed Gems Cost Life instead of Mana, affects all version.
2.1.1	Fixed a bug where you could not get stunned while wearing the boots with the Blood Magic Keystone allocated.
1.3.0	When Blood Magic is active, your mana orb no longer shows as fully reserved.
1.0.0	Players now cannot spend or reserve their last point of life with Blood Magic.
0.9.12p	Fixed a bug where skills would appear disabled if you have Blood Magic.
0.9.12m	Fixed a bug where players who cast their auras and then return to town to select the Blood Magic keystone passive will have free auras until they log out.
0.9.11	Totems with Blood Magic (from either a Support Gem or the player's passives) now do not spend their own life to cast spells.
0.9.10	Totems using percentage reserve skills with blood magic now correctly base the cost as a percentage of their life rather than yours.
0.9.9c	Blood Magic now no longer prevents traps from working.
0.9.7d	Fixed the interaction between Chaos Inoculation and Blood Magic so that there's no crazy bugged death state any more. If you try to reserve life or mana when you have both of these keystones, you will now die properly.
0.9.4	Introduced to the game.