The fantastic thing about Path of Exile is that as long as you meet the requirements, you can put the gem into a corresponding slot in one of your poe items, then you can use any active skills. As the gem can level up so you can use it more and make the active skill grow stronger. There are five of the best skill gems that are used commonly in Path of Exile Items. They're used for utility and effectiveness against enemies, as well as being fit for certain character builds. Also you can use some of skill gems to exchange some special orbs, such as exalted orb.
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The attack skill consists of an initial single-target fire melee attack, which followed by an AoE fire projectile attack. The area of effect of the projectiles spread throughout a 270-degree arc within a radius of 5 to 20 units, which can be enhanced for better effect and more damage. The various properties of the magma projectiles, as well as the melee fire attack itself, give this skill plenty of damage that can be enhanced with other support gems.
Basically it’s a trap skill that explodes when it is triggered, leaving fire in its wake that damages all enemies. Maybe you think that traps don't get as much use in this game, but Fire Trap has quite a bit of utility even in the late game as it's useful for doing extra damage while kiting enemies.
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