Demon Form

Demon FormBuff, Persistent
Level: (1-20)Shapeshift into a demon, vastly boosting the power of your Spells. You gain Demonflame every second you remain in demon form, causing your Life to be lost at an ever-increasing rate. Revert to human form if you reach 1 Life, use a Skill that isn't a Spell, or reactivate this Skill.(12-25)% increased Cast Speed while in Demon Form
+(3-6) to Level of all Spell Skills while in Demon Form
Lose 0.5% of Life per second per Demonflame
Deal (7-18)% increased Spell damage per DemonflameSkills can be managed in the Skills panel.

Acquisition
Drop disabled
Granted by the Infernalist ascendancy notable Demonic PossessionMetadata
Item class: Skill Gem
Metadata ID: Metadata/Items/Gem/SkillGemAscendancyDemonForm

Demon Form is a shapeshifting skill granted by the Infernalist ascendancy notable Demonic Possession that allows the player to Shapeshift into a Demon. While transformed, you gain a large bonus to spellcasting, but lose life over time. While transformed, you gain stacks of Demonflame over time, which increases spell damage but causes life loss over time.

Skill functions and interactions

Shapeshifting skills disable both your weapon slots while transformed. They also grant a third weapon set passive skill tree option.

Demon Form will automatically deactivate at 1 Life, making it incompatible with Chaos Inoculation.

Demonflame is considered life loss, not damage. As a result, it cannot be redirected to other resources such as Mind Over Matter or mitigated through damage reduction. Demonflame will interrupt energy shield recharge (or life recharge with Eternal Youth).

As Demonflame life loss is based on maximum life, Demon Form can be easier to manage by combining flat life regeneration with #% reduced Maximum Life, such as from Ming's Heart or Couture of Crimson.

Each stack of Demonflame has a minimum of 1 Life loss per second.

While in Demon Form, the player is considered as floating, and will not trigger step effects such as Decompose.

Gem level progression

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Level
1	1
2	3
3	6
4	10
5	14
6	18
7	22
8	26
9	31
10	36
11	41
12	46
13	52
14	58
15	64
16	66
17	72
18	78
19	84
20	90

Recommended support gems

The following support gems are recommendations by GGG as listed in-game, and do not necessarily reflect optimal combinations or the views of the wiki.

Gem tier	Support gems
I
II
III

Version history

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Version	Changes
0.1.0e	(Hotfix 7) Fixed a bug that could cause some characters to be disconnected, most notably when trying to use the Demon Form skill granted by the Demonic Possession Infernalist Ascendancy Passive Skill.
0.1.0c	(Hotfix 2) Demon form now has a minimum of 1 life lost per second, per stack.
0.1.0	Introduced to the game.