Harmless versions of these discuses are used by athletes in Ellumara's undercity. Their unpredictable flight patterns allow them to blindside unsuspecting athletes when they return to their throwers' hand.
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Plasmalyte Ring
Weapon (chakram), exotic, uncommon (requires attunement)
Exotic. You are only proficient with this weapon if you have the appropriate background or training (at GM's discretion).
Chakram. This basic ring-shaped weapon is a martial weapon used only by those familiar with their design. It has the Light, Finesse, and Thrown properties with a range of (30/120), and deals 1d6 slashing damage on a hit.
Illuminating Streak. This weapon sheds dim light in a 5-foot radius. Immediately after you hit or miss with a ranged attack with this weapon, it flies back into your hand. As it flies, it leaves behind an intangible noblelight trail that lasts until the start of your next turn and ends early if it overlaps an area of magical darkness. Each space the trail passes through is filled with dim light that suppresses the effects of difficult terrain within it for you and your allies.
Ricochet Flight. Once per turn, if you miss a creature with a ranged weapon attack using this weapon, the weapon ricochets for a second swipe. Make a new ranged attack roll. If this attack hits, the weapon deals 1d4 slashing damage, but you don't add your ability modifier to it unless it is negative.
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Rare Variant. The rare version of this weapon grants a +1 bonus to attack and damage rolls made with it.
Very Rare Variant. The very rare version of this weapon grants a +2 bonus to attack and damage rolls made with it.
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DESIGN COMMENTARY
The other TRON-inspired weapon from the Phosphora lumenguild (last one, I promise). The weapon is fairly straightforward: it sheds light, and offers a situational benefit in suppressing difficult terrain to aid your allies.
The meat behind the weapon is the Ricochet Flight (all identity disks ricochet, of course). It essentially allows you to hit better, dealing less damage on a miss. Its ability accounts for maybe 60% of a typical Uncommon item's power level, but has the benefit of comboing well with certain effects that requires you to hit with the weapon, such as smite spells.
Design-wise, I did my best to distance it from the iconic TRON disk, adding a central grabbing handle and using a rotational symmetry design instead of axial symmetry. I hadn't rendered black glass for so long I forgot how to do it, and nearly rendered the black disk material as some sort of soft, dimpled rubber. Fortunately, I came to my senses.