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The attack damage % used by the Magma Spray is derived explicitly from the base off hand fire damage inherent to the gem itself. No amount of damage on a weapon in the main hand will contribute to Magma Spray damage.
Focusing on the Armour value on your shield is one of the methods for scaling Magma Spray damage.
Passive tree nodes that contain the text X% increased Defences from Equipped Shield such as Towering Shield, Core of the Guardian, Spiked Shield, and Flashy Deflection do not impact Magma Spray damage. Instead, they impact the final Armour value added to the player rather than the implicit Armour value of the shield itself.
Gem level progression
Level
Attack Damage
Off Hand Fire Damage
Added Fire Damage
1
1
1
120%
4 to 7
2 to 3
2
3
9
132%
6 to 9
2 to 3
3
6
16
146%
8 to 11
2 to 3
4
10
25
160%
10 to 15
2 to 3
5
14
34
174%
12 to 19
2 to 3
6
18
43
189%
15 to 23
2 to 4
7
22
52
204%
19 to 29
2 to 4
8
26
61
218%
24 to 35
2 to 4
9
31
72
232%
29 to 43
2 to 4
10
36
83
246%
35 to 53
2 to 4
11
41
95
262%
43 to 64
3 to 5
12
46
106
280%
51 to 77
3 to 5
13
52
119
299%
62 to 93
3 to 5
14
58
133
319%
75 to 113
3 to 5
15
64
146
342%
91 to 136
3 to 5
16
66
151
367%
110 to 164
4 to 6
17
72
164
393%
132 to 198
4 to 6
18
78
178
423%
160 to 240
4 to 6
19
84
191
455%
193 to 290
4 to 6
20
90
205
490%
234 to 351
4 to 6
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
Module Error: No results found for item using search term "item_name = Fire Infusion"
Module Error: No results found for item using search term "item_name = Magnified Effect"
II
Module Error: No results found for item using search term "item_name = Close Combat"
Exploit WeaknessExploit WeaknessSupport, Payoff Category: Exploit Weakness Tier: 2 Cost & Reservation Multiplier: 130%Support Requirements: +5 StrSupports any skill that Hits enemies, causing them to deal more Damage against enemies with Broken Armour but preventing them from Breaking Armour themselves. Cannot support skills that ConsumeBroken Armour.Supported Skills cannot Break Armour Supported Skills Consume Enemy Fully Broken Armour to deal 40% more DamagePlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
III
Elemental FocusElemental FocusSupport Category: Elemental Focus Tier: 3Support Requirements: +5 IntSupports any skill that Hits enemies, causing it to deal more Elemental Damage but be unable to inflict Elemental Ailments.Supported Skills deal 25% more Elemental Damage Supported Skills cannot inflict Elemental AilmentsPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
ImmolateImmolateSupport, Fire, Payoff Category: Immolate Tier: 3Support Requirements: +5 StrSupports Attacks, granting them extra Fire damage against Ignited enemies but making them unable to Ignite enemies themselves.Supported Skills cannot Ignite Supported AttacksGain 30% of Damage as extra Fire Damage against Ignited enemiesPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
IV
V
Item acquisition
Magma Barrier has restrictions on where or how it can drop.
Exploit WeaknessExploit WeaknessSupport, Payoff
Elemental FocusElemental FocusSupport
ImmolateImmolateSupport, Fire, Payoff
