Pyros Weapons come without any sub-stats and they do not have any Materia slots. However, once you obtain them, you can talk to Gerolt, who will tell you to gather Vitiated Aether in the same way again, but this time in Eureka Pyros. Similarly to Eureka Pagos, these can be converted to Smoldering Protean Crystals at the Mark II Crystal Forge. You will need two of these crystals to unlock your first sub-stats at the Mnemeworks Station. These sub-stats are random and you can reroll them by reforging the weapon with two more Smoldering Crystals again, as often as you want. Rerolling your sub-stats has a chance to unlock additional sub-stat slots, up to five in total. Once a sub-stat slot is unlocked, subsequent rolls will reroll all unlocked slots. Multiple slots can roll the same sub-stat, which will then be added together to the weapon.
Pyros Crystal + 5 
Penthesilea's Flame + 30 Logos Actions unlocked
Customizable secondary attributes
