Chain Casting Fusion Bolt Damage

After some quick testing it appears to be because you are using a CC wand with a fusion wand and how the game treats the bolts. As the page says with a CC wand you can't perform fusion with the native element first (because it'll chaincast). You perform (in this example) ice first and then fire. The fire will still for some reason chaincast but at the same time fuse with the ice. The cool result would be if we got five charges of ice/fire, the end result is that you have one charge of ice/fire and four charges of fire and this is how the game seems to treat it. You'll shoot one charge of ice/fire and it's treated as single/primary stack of ice/fire regardless of the circumstances.

The reason why this happens seems to be because of how ice/fire normally works with a full stack, you shoot up to five, four, three, two and then one charges of firebolt in each fused bolt. You shoot a single charge of ice/fire which due to the single ice charge has the power of a single ice/fire charge and then reduces the stack by one which results in no more ice/fire and a four charge firebolt. For the same reason you don't get the "residual" fire charges with lighting/fire because it all charges are expended at once anyway.