Combustion Support

Combustion SupportFire, Support
Icon: i
Mana Multiplier: 120%Requires Level 8Supports any skill that hits enemies.Per 1% Quality:
Supported Skills deal 0.5% increased Fire DamageSupported Skills have (30-49)% chance to Ignite
Supported Skills deal (10-29)% more Fire Damage
Enemies Ignited by Supported Skills have -(10-19)% to Fire ResistanceThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.Acquisition
Level: 8Purchase Costs

Normal

1x Orb of Transmutation

Sell Price
1x Scroll FragmentMiscellaneous
Item class: Support Skill Gems
Metadata ID: Metadata/Items/Gems/SupportGemChanceToIgnite

Combustion is a support gem that grants supported skills that grants more fire damage and chance to ignite the enemy. Enemies ignited by the supported skill have reduced fire resistance.

Skill functions and interactions

The Chance to Ignite an enemy given by this gem is independent of the chance to ignite an enemy as a result of a critical strike. The overall probability that an enemy will be ignited is:

$\pagecolor[RGB]{15,15,15} \color[RGB]{163,141,109} \text{ChanceToIgnite} = 1-(1 - \text{SkillCritChance}) * (1 - \text{SkillIgniteChance})$

It is worth noting that as opposed to chance to critical strike, which is checked once for each cast of the skill, the chance to ignite is checked separately for each individual hit. For instance an explosion from Molten ShellMolten ShellSpell, AoE, Duration, Fire, Physical, Guard
Radius: 15
Mana Cost: (8-12)
Can Store 1 Use(s)
Cooldown Time: 4.00 sec
Cast Time: 0.00 secRequires Level 4Applies a buff that adds to your armour, and can take some of the damage from hits for you before being depleted. When the buff expires or is depleted, the skill deals reflected damage to enemies around you based on the total damage that was taken from the buff. Shares a cooldown with other Guard skills.Per 1% Quality:
1% increased Skill Effect Duration(50-858) additional Armour
75% of Damage from Hits is taken from the Buff before your Life or Energy Shield
Buff can take Damage equal to 20% of your Armour, up to a maximum of 10000
Reflects (100-3000)% of Damage taken from Buff as Fire Damage when Buff expires or is depleted
This Skill's Cooldown does not recover during its effectPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket. linked with Combustion that hits two enemies at once could potentially ignite one enemy, but not the other.

The chance to Ignite from this gem will stack additively with chance to Ignite modifiers from other sources, such as from the Blaze notable passive skill, or the quality bonus on FireballFireballProjectile, Spell, AoE, Fire
Radius: 9
Mana Cost: (6-25)
Cast Time: 0.75 sec
Critical Strike Chance: 6.00%
Effectiveness of Added Damage: 180%
Projectile Speed: 1040Unleashes a ball of fire towards a target which explodes, damaging nearby foes.Per 1% Quality:
0.5% chance to Ignite enemiesDeals (9-1095) to (14-1643) Fire Damage
(20-39)% chance to Ignite enemies
(50-88)% more Damage with Ignite
+(0-4) to radiusPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket..

The normal rules for burning apply, linking this gem to a skill that deals no fire damage is pointless; unless the user is igniting enemies via cold damage skills with The Three DragonsThe Three Dragons
Golden MaskQuality: +20%
Evasion: 115
Energy Shield: 22Requires Level 35, 40 Dex, 40 Int+(26-30)% to all Elemental Resistances
Your Fire Damage can Shock but not Ignite
Your Cold Damage can Ignite but not Freeze or Chill
Your Lightning Damage can Freeze but not Shock"The ice seared his naked feet
As the lightning stilled his heart,
But it was the flames upon his lover's face
That roused him to vengeance."
- From 'The Three Dragons' by Victario of Sarn or HrimburnHrimburn
Goathide GlovesQuality: +20%
Evasion: (86-98)Requires Level 24, 17 Dex+(20-30) to Strength
Adds (5-7) to (13-15) Cold Damage to Spells and Attacks
+(40-50) to Evasion Rating
+(20-30)% to Cold Resistance
50% of Physical Damage Converted to Cold Damage
Reflects 10 Cold Damage to Melee Attackers
Your Cold Damage can IgniteGiant's blood you cannot tame,
as wild as an unwatched flame., or via lightning damage using StormfireStormfire
Opal RingRequires Level 80(15-25)% increased Elemental Damage(40-45)% increased Mana Regeneration Rate
+(20-30)% to Fire and Lightning Resistances
(4-6)% increased Burning Damage for each time you have Shocked a Non-Shocked Enemy Recently
Adds (1-3) to (62-70) Lightning Damage to Hits against Ignited Enemies
Your Lightning Damage can IgniteWhen your skin sloughs, and your blood cooks,
you'll wish the lightning strike had killed you..

Gem level progression

Level			Ignite Chance	more Fire Damage	resistance reduction	Exp.	Total Exp.
1	8	18	30%	10%	-10%	0	0
2	10	21	31%	11%	-10%	3,231	3,231
3	13	25	32%	12%	-11%	9,569	12,800
4	17	31	33%	13%	-11%	28,189	40,989
5	21	37	34%	14%	-12%	59,146	100,135
6	25	43	35%	15%	-12%	111,192	211,327
7	29	49	36%	16%	-13%	193,800	405,127
8	33	55	37%	17%	-13%	320,280	725,407
9	37	61	38%	18%	-14%	507,839	1,233,246
10	40	66	39%	19%	-14%	554,379	1,787,625
11	43	70	40%	20%	-15%	755,049	2,542,674
12	46	75	41%	21%	-15%	1,016,533	3,559,207
13	49	79	42%	22%	-16%	1,898,602	5,457,809
14	52	84	43%	23%	-16%	1,964,019	7,421,828
15	55	88	44%	24%	-17%	2,573,731	9,995,559
16	58	93	45%	25%	-17%	7,610,839	17,606,398
17	61	97	46%	26%	-18%	13,436,884	31,043,282
18	64	102	47%	27%	-18%	25,050,611	56,093,893
19	67	106	48%	28%	-19%	43,867,388	99,961,281
20	70	111	49%	29%	-19%	242,078,618	342,039,899
21	72	114	50%	30%	-20%	N/A	N/A
22	74	N/A	51%	31%	-20%	N/A	N/A
23	76	N/A	52%	32%	-21%	N/A	N/A
24	78	N/A	53%	33%	-21%	N/A	N/A
25	80	N/A	54%	34%	-22%	N/A	N/A
26	82	N/A	55%	35%	-22%	N/A	N/A
27	84	N/A	56%	36%	-23%	N/A	N/A
28	86	N/A	57%	37%	-23%	N/A	N/A
29	88	N/A	58%	38%	-24%	N/A	N/A
30	90	N/A	59%	39%	-24%	N/A	N/A
31	91	N/A	59%	39%	-24%	N/A	N/A
32	92	N/A	60%	40%	-25%	N/A	N/A
33	93	N/A	60%	40%	-25%	N/A	N/A
34	94	N/A	61%	41%	-25%	N/A	N/A
35	95	N/A	61%	41%	-25%	N/A	N/A
36	96	N/A	62%	42%	-26%	N/A	N/A
37	97	N/A	62%	42%	-26%	N/A	N/A
38	98	N/A	63%	43%	-26%	N/A	N/A
39	99	N/A	63%	43%	-26%	N/A	N/A
40	100	N/A	64%	44%	-27%	N/A	N/A

Item acquisition

Upgrade paths

This item can be acquired through the following upgrade paths or vendor recipes:

Amount	Ingredient	Ingredient Notes
7	Dialla's SubjugationDialla's Subjugation7Superior Support Gem Quality: +23% CorruptedA symbol of beauty and innocence The gems corrupted her mind Malachai corrupted her gems All but a glimmer of greatness lost in madness	random corrupted 23% Support gem
6	The FoxThe Fox6Level 20 Gem"Masters of wit, strength and cunning. To survive the harsh winters, you must be like the fox." - Ezomyte Proverb	random level 20 gem
3	Gemcutter's PromiseGemcutter's Promise3Superior Gem Quality: +20%"I swore to use my position to help the people. What good is power when it just accumulates on the already-powerful?" - Erasmus, Imperial Gemcutter	random 20% gem

Usage in upgrade paths

This item is used by upgrade paths or vendor recipes to create the following items:

Outcome	Amount	Ingredient	Ingredient Notes
The Goddess ScornedThe Goddess Scorned Elegant SwordOne Handed Sword Quality: +20% Physical Damage: (74-84)–(122.1-138.6) Critical Strike Chance: (9.50%-10.50%) Attacks per Second: 1.50 Weapon Range: 11Requires Level 28, 46 Str, 55 Dex+190 to Accuracy RatingUses both hand slots (250-300)% increased Physical Damage (90-110)% increased Critical Strike Chance +(20-30)% to Global Critical Strike Multiplier +(40-50)% to Fire Resistance Cannot be Ignited 100% of Physical Damage Converted to Fire Damage Ignites you inflict deal Damage 50% faster You can only deal Damage with this Weapon and IgniteHer purpose seems done; the oath is fulfilled. Rust dulls her smirk with the last demon killed. The embers grow dim and yet hope burns her lips: "An old flame renewed can define our eclipse!"	1	The Goddess BoundThe Goddess Bound Whalebone RapierOne Handed Sword Quality: +20% Physical Damage: (14.8-16.8)–(62.9-71.4) Elemental Damage: 3–7 Critical Strike Chance: 5.50% Attacks per Second: 1.92 Weapon Range: 14Requires Level 7, 32 Dex+25% to Global Critical Strike Multiplier+1 to Level of Socketed Melee Gems Uses both hand slots (250-300)% increased Physical Damage Adds 3 to 7 Fire Damage 20% increased Attack Speed 30% increased Global Critical Strike Chance +(20-40) to Evasion Rating 20% reduced Rarity of Items found 30% increased Movement Speed when on Low LifeShe paints her offer in wicked hues An off-white grin, an elegant bruise. To the nascent scourge she sings the ruse: "With me in hand, what else need you use?"	With 20% quality.
	1	Elegant SwordElegant SwordOne Handed Sword Physical Damage: 20–33 Critical Strike Chance: 5.00% Attacks per Second: 1.50 Weapon Range: 11Requires Level 28, 46 Str, 55 Dex+190 to Accuracy Rating	Base type, with 20% quality and which has sockets that exactly match those on the Goddess Bound, number, color and links included.
	1	Combustion SupportCombustion SupportFire, Support Icon: i Mana Multiplier: 120%Requires Level 8Supports any skill that hits enemies.Per 1% Quality: Supported Skills deal 0.5% increased Fire DamageSupported Skills have (30-49)% chance to Ignite Supported Skills deal (10-29)% more Fire Damage Enemies Ignited by Supported Skills have -(10-19)% to Fire ResistanceThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.	With at least 1% quality.
	1	Orb of FusingOrb of FusingStack Size: 20Reforges the links between sockets on an itemRight click this item then left click a socketed item to apply it. The item's quality increases the chances of obtaining more links. Shift click to unstack.	N/A

Quest reward

This item is given as quest reward for the following quests:

Class →	Witch	Shadow	Ranger	Duelist	Marauder	Templar	Scion
Quest ↓
The Caged Brute Act 1	✓	✗	✗	✗	✗	✓	✗

Vendor reward

This item can be bought at the listed npc vendors after completing the following quests:

Class →	Witch	Shadow	Ranger	Duelist	Marauder	Templar	Scion
Quest ↓
The Caged Brute Act 1 Nessa	✓	✓	✗	✗	✓	✓	✗
A Fixture of Fate Act 3 Siosa	✓
Fallen from Grace Act 6 Lilly Roth	✓

Version history

Version	Changes
3.3.0	The Chance to Ignite Support Gem has been renamed to Combustion Support. Enemies ignited by supported skills lose up to 19% fire resistance. At gem level 20, it has 29% more fire damage, 49% chance to ignite, and -19% fire resistance on ignited enemies.
3.0.0	Chance to Ignite now grants 10% more Fire Damage at gem level 1, up to 29% more Fire Damage at gem level 20.
0.9.9	Increased mana cost multiplier from 100% to 110%.
0.9.4e	Fixed a bug where Chance to Ignite did not scale properly under the Elemental Weakness curse.
0.9.3	Chance to Ignite has been added to the game.