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Weapon Fusions

A weapon fusion is a small, prepackaged add-on that can be attached to any weapon to infuse it with magic. Adventurers use weapon fusions to customize their weapons for a specific enemy or to increase a weapon’s overall effectiveness. Weapon fusions are magic unless stated otherwise. While this causes the weapons they are installed in to be considered hybrid items, in truth the weapon and the fusion still operate separately. An ability that affects a magic item could affect the fusion installed in a weapon, but that would not prevent the weapon’s core function from operating normally unless the weapon was also independently a magic device. The hybridized fusion (see page 194) is an exception to this rule, as noted in its description. Weapons with fusions are considered magic for the purpose of overcoming damage reduction.
Click here for the remaining rules on Weapon Fusions.


Source Starfinder Armory pg. 63
Item Level 8
The continuous fusion lets a weapon with the line special property sustain fire continuously by expending additional charges. When you make a line attack with a weapon with this fusion, you can expend additional ammunition or charges equal to the weapon’s usage value to sustain your attack until the start of your next turn. This has no additional effect on targets already within the line, but anything that moves across your weapon’s line is attacked using your original attack roll and damage. If you hit but fail to damage this new target, it blocks your line as normal. If an existing blockage is removed, your line extends out to its maximum range unless blocked anew, and it can damage creatures and objects that it failed to reach previously. You can’t damage a single target more than once in a round with the continuous fusion, even if it moves in and out of the path of your attack. If you move from where you initiated the attack for any reason, your line automatically ends. Only weapons that can make a line attack benefit from this fusion. You can use the continuous fusion with unwieldy weapons.