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Magma Barrier is an attackskill that infuses your shield with magma. A magma-infused shield releases a spray of magma when struck, damaging enemies. This effect has a short cooldown between uses. Magma Barrier requires an equipped shield.
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.
Using Resonating Shield counts as raising your Shield for the purposes of activating Magma Barrier, infusing your shield with magma during the first 0.5 seconds of the animation. Conversely using Shield Charge does not count as raising your Shield.
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.
Fire InfusionSupport, Attack, Fire Tier: 1Support Requirements: +5 StrSupports Attacks, causing them to GainFire Damage but deal less Cold and Lightning Damage.Supported AttacksGain 25% of Damage as extra Fire Damage Supported Attacks deal 50% less Cold and Lightning DamagePlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple copies of the same Support Gem socketed at the same time.Magnified EffectSupport, AoE Tier: 1 Cost & Reservation Multiplier: 130%Support Requirements: +5 IntSupports any skill with an area of effect, making it larger.Supported Skills have 30% more Area of EffectPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple copies of the same Support Gem socketed at the same time.Close CombatSupport, Attack Tier: 2 Cost & Reservation Multiplier: 120%Support Requirements: +5 DexSupports Attacks, causing them to deal more damage to enemies based on how close they are to you.Supported Skills deal 25% more Attack Damage to enemies within 1 metre of you, scaling down to no bonus at 3.5 metres or furtherPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple copies of the same Support Gem socketed at the same time.Exploit WeaknessSupport, Payoff 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 copies of the same Support Gem socketed at the same time.Elemental FocusSupport 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 copies of the same Support Gem socketed at the same time.ImmolateSupport, Fire, Payoff 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 copies of the same Support Gem socketed at the same time.