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 deal fire damage a chance to ignite the enemy.

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
Radius: 15
Mana Cost: (8-28)
Cast Time: 0.50 sec
Critical Strike Chance: 5.00%
Damage Effectiveness: 200%Requires Level 4Summons fiery elemental shields providing additional armour for a short duration. If cumulative physical damage prevented by your blocking or armour reaches a threshold, the shields explode outwards, dealing fire damage to surrounding enemies.Per 1% Quality:
1% chance to Ignite enemiesDeals (14-1962) to (20-2943) Fire Damage
Shields break after (26-1508) total Damage is prevented
(17-943) additional Armour
Base duration is 10 secondsPlace 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: (6-26)
Cast Time: 0.75 sec
Critical Strike Chance: 6.00%
Damage Effectiveness: 160%
Projectile Speed: 1040Unleashes a ball of fire towards a target which explodes, damaging nearby foes.Per 1% Quality:
0.5% chance to Ignite enemiesDeals (7-890) to (10-1335) 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%	N/A	0	0
2	10	21	31%	11%	N/A	3,231	3,231
3	13	25	32%	12%	N/A	9,569	12,800
4	17	31	33%	13%	N/A	28,189	40,989
5	21	37	34%	14%	N/A	59,146	100,135
6	25	43	35%	15%	N/A	111,192	211,327
7	29	49	36%	16%	N/A	193,800	405,127
8	33	55	37%	17%	N/A	320,280	725,407
9	37	61	38%	18%	N/A	507,839	1,233,246
10	40	66	39%	19%	N/A	554,379	1,787,625
11	43	70	40%	20%	N/A	755,049	2,542,674
12	46	75	41%	21%	N/A	1,016,533	3,559,207
13	49	79	42%	22%	N/A	1,898,602	5,457,809
14	52	84	43%	23%	N/A	1,964,019	7,421,828
15	55	88	44%	24%	N/A	2,573,731	9,995,559
16	58	93	45%	25%	N/A	7,610,839	17,606,398
17	61	97	46%	26%	N/A	13,436,884	31,043,282
18	64	102	47%	27%	N/A	25,050,611	56,093,893
19	67	106	48%	28%	N/A	43,867,388	99,961,281
20	70	111	49%	29%	N/A	242,078,618	342,039,899
21	72	114	50%	30%	N/A	N/A	N/A
22	74	N/A	51%	31%	N/A	N/A	N/A
23	76	N/A	52%	32%	N/A	N/A	N/A
24	78	N/A	53%	33%	N/A	N/A	N/A
25	80	N/A	54%	34%	N/A	N/A	N/A
26	82	N/A	55%	35%	N/A	N/A	N/A
27	84	N/A	56%	36%	N/A	N/A	N/A
28	86	N/A	57%	37%	N/A	N/A	N/A
29	88	N/A	58%	38%	N/A	N/A	N/A
30	90	N/A	59%	39%	N/A	N/A	N/A
31	91	N/A	59%	39%	N/A	N/A	N/A
32	92	N/A	60%	40%	N/A	N/A	N/A
33	93	N/A	60%	40%	N/A	N/A	N/A
34	94	N/A	61%	41%	N/A	N/A	N/A
35	95	N/A	61%	41%	N/A	N/A	N/A
36	96	N/A	62%	42%	N/A	N/A	N/A
37	97	N/A	62%	42%	N/A	N/A	N/A
38	98	N/A	63%	43%	N/A	N/A	N/A
39	99	N/A	63%	43%	N/A	N/A	N/A
40	100	N/A	64%	44%	N/A	N/A	N/A

Item acquisition

Upgrade paths

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

• 7x 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)
• 6x 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)
• 3x 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)

Quest reward

This skill 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 skill 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.