Fire Shark
Mythical Item
1 Range
15-25 Explosive Damage
+90 Heat Damage
5 Explosive Resistance Drain
2 Uses Per Battle
-8 Energy and +32 Heat Per Use
64 Weight

Fire Sabre
Mythical Item
1 Range, 1 Knockback
25-35 Explosive Damage
+70 Heat Damage
-15 Energy and +24 Heat Per Use
76 Weight

Electron Sabre
Mythical Item
1 Range
25-35 Electric Damage
-100 Energy Damage
-45 Energy and +15 Heat Per Use
84 Weight

Vote & comment on these ideas and suggest new ones.

Fire Shark is too OP

Put a knockback on the Fire Sabre

And the Electron Sabre would still be rendered obselete by the Call of Lightning

EDITED:

Fire Shark: Heat damage increase to +90 from +80
Resistance Drain increase to +5 from +4
Weight increase to 64 from 48.
Energy required to 8 from 5.
Heat-to-user to 32 from 30.

Fire Sabre: Added knockback.

Electron Sabre: Increased energy drain to 100 from 70, increased
weight to 84 from 78, increased required energy to 45 from 28 and heat-to-user to 15 from 8.