Combustion Support

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. Note

Skill functions and interactions

Note that even though this skill 'Supports any skill that hits enemies', by default only fire damage can ignite. Therefore it by default only helps skills dealing fire damage, see more on ignite, including uniques that enable other elements to ignite. The fire damage could be supplied by gear or for minions for instance a jewel with 'Minions deal additional Fire Damage'.

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:

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

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 example, a hit from 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 Ash, Frost and Storm notable passive skill, or the stat of .

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 or , or via lightning damage using .

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%	3231	3231
3	13	25	32%	12%	-11%	9569	12800
4	17	31	33%	13%	-11%	28189	40989
5	21	37	34%	14%	-12%	59146	100135
6	25	43	35%	15%	-12%	111192	211327
7	29	49	36%	16%	-13%	193800	405127
8	33	55	37%	17%	-13%	320280	725407
9	37	61	38%	18%	-14%	507839	1233246
10	40	66	39%	19%	-14%	554379	1787625
11	43	70	40%	20%	-15%	755049	2542674
12	46	75	41%	21%	-15%	1016533	3559207
13	49	79	42%	22%	-16%	1898602	5457809
14	52	84	43%	23%	-16%	1964019	7421828
15	55	88	44%	24%	-17%	2573731	9995559
16	58	93	45%	25%	-17%	7610839	17606398
17	61	97	46%	26%	-18%	13436884	31043282
18	64	102	47%	27%	-18%	25050611	56093893
19	67	106	48%	28%	-19%	43867388	99961281
20	70	111	49%	29%	-19%	242078618	342039899
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

Version history

Version	Changes
3.15.0	Now has a 140% Cost and Reservation Multiplier (previously 120%). Supported Skills now have 25% chance to Ignite (previously 30-49%). Supported Skills now deal 10-19% more Fire Damage (previously 10-29%). Enemies Ignited by Supported Skills now have -10% to Fire Resistance (previously -10-19%).
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.