Combustion Support

Combustion Support is a support gem.

Supports any skill that hits enemies.

Fire, Support. Level: 1–20. Cost & Reservation Multiplier: 130%. Requires Level 8.

Supported Skills deal (10–19)% more Fire Damage
Supported Skills have 25% chance to Ignite
Enemies Ignited by Supported Skills have -10% to Fire Resistance

This 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.

Name	Additional Effects From Quality	Weight
Combustion Support	Supported Skills deal (0–10)% increased Fire Damage	50

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Related Gems

Name	Additional Effects From Quality	Weight
Combustion Support	Supported Skills deal (0–10)% increased Fire Damage	50
Anomalous Combustion Support	Ignites from Supported Skills deal Damage (0–5)% faster	100
Divergent Combustion Support	Ignites from Supported Skills deal Damage (0–10)% slower Supported Skills deal (0–20)% increased Fire Damage	50

Why do Combustion and Bonechill Support not work properly when a stronger Ignite/Chill are applied?

We've investigated this internally and have found that this behaviour was due to an optimisation that was introduced in 3.15. It can affect anything that adds an effect to things while your ailment is on them (e.g. Combustion, Bonechill, Taryn's Shiver, etc.). We've found that it only affects elemental ailments and that the order ailments are inflicted is not important but the remaining duration can be.

The optimisation we made is that elemental ailments are discarded if they can never become the active one affecting the enemy. An ailment is only discarded this way if there is at least one stronger ailment suppressing it which also has equal or longer duration (so the weaker one can never be "promoted" to active by outlasting the stronger one). Ailments usually having matching durations is why players are reaching conclusions about order mattering - the most recent ailment will usually have the most remaining duration, and thus not be discarded.

We plan to fix this behaviour so ailments with these kinds of extra effects tied to them are not discarded this way. The fix for this won't make it in time for release but we'll aim to get it out in a patch following it.

Level Effect

Level	Requires Level	Intelligence	Supported Skills deal 10% more Fire Damage	Experience
1	8	18	10	3,231
2	10	21	10	9,569
3	13	25	11	28,189
4	17	31	11	59,146
5	21	37	12	111,192
6	25	43	12	193,800
7	29	49	13	320,280
8	33	55	13	507,839
9	37	61	14	554,379
10	40	66	14	755,049
11	43	70	15	1,016,533
12	46	75	15	1,898,602
13	49	79	16	1,964,019
14	52	84	16	2,573,731
15	55	88	17	7,610,839
16	58	93	17	13,436,884
17	61	97	18	25,050,611
18	64	102	18	43,867,388
19	67	106	19	242,078,618
20	70	111	19
21	72		20
22	74		20
23	76		21
24	78		21
25	80		22
26	82		22
27	84		23
28	86		23
29	88		24
30	90		24
31	91		24
32	92		25
33	93		25
34	94		25
35	95		25
36	96		26
37	97		26
38	98		26
39	99		26
40	100		27

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

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:

ChanceToIgnite=1-(1-SkillCritChance)*(1-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 Consecrated Path 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 Firestorm.

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 Dragons or Hrimburn, or via lightning damage using Stormfire.

Item acquisition

Combustion Support can drop anywhere. Drop level: 8.

Recipes

Combustion Support can be created from the following recipes:

Amount	Part	Description
9	Gift of the Gemling Queen	Random level 20 support gem
7	Dialla's Subjugation	Random corrupted support gem with 23% quality
6	The Fox	Random level 20 gem
8	Dying Anguish	Random level 19 gem with 19% alternative quality
8	The Hook	Random corrupted level 21 gem with 23% alternative quality
3	Gemcutter's Promise	Random gem with 20% quality
1	Gemcutter's Incubator	Random gem with 1–20% quality
1	The Void	Random divination card set exchange

Usage in recipes

Combustion Support is used in the following recipes:

Result	Amount	Part	Notes
The Goddess Scorned	1	The Goddess Bound	With 20% quality.
1	Elegant Sword	Base type, with 20% quality and which has sockets that exactly match those on the Goddess Bound, number, color and links included.
1	Combustion Support	With at least 1% quality.
1	Orb of Fusing	N/A

Quest reward

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

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