Maxwell's Thermic Engine
|A strange sword, one blade blistering hot and the other icy cold. When it hits its target the thermal gradient increases. What causes this effect is unknown but it is rumored that otherworldly forces are involved.|
+2 double sword
The enchantment increases by 1 or 2 each time the sword lands a hit, including those from ripostes. This caps out at +14.
The enchantment decreases by 1 for each turn spent not hitting a creature (i.e. not attacking, moving, waiting, missed swings, etc.), but will not decrease past the base level of +2. The enchantment immediately drops to +2 if the sword is unwielded.
Fairly high. Double swords are already one of the best one-handed Long Blades, and flaming and freezing are among the best brands available for them. A double sword that can make use of both brands at once and has an enchantment that increases as you use it is an excellent choice for any aspiring swordsman.
Don't worry about fighting hydras with this weapon; it will cauterize their heads like any other weapon of flaming.