Arm cannon

• Kythriel absolutely loves creating new, unique and destructive machinery. This weapon is no exception. An arm cannon attached to a warforged has ever been seen before and will certainly turn some heads. Either out of amazement or utter fear. 
• 1. Cone spells can become line spells. (Ex. 15ft cone becomes 45ft line spell)
• 2. Area of effect spells can be tightened to deal 2d6 more damage of the spell's type
• 3. Spells can be charged for triple damage (requires concentration)
  A full turn can be taken to charge a spell to increase its power. On the first turn the spell and spot of casting must be chosen. Both arms must be free and no enemies can be within 5ft. On the 2nd turn the attack will happen and on a hit, triple damage dice will be rolled. If any damage is taken will charging roll a Constitution saving throw DC10 increasing by 2 for each instance of damage taken while charging.
• On a failed save roll a D6
  2-6 Phizzle: spell dissipates and 2nd turn is taken as normal
  1 Catastrophy: The spell will go off partially charge (double damage) in a random direction (D12)

Notes: This weapon has to be manufactured to Sparky's arm in replacement with his regular arm by Kythriel.