Armour Cannon

You channel internal flame through your armored vessel, opening vents or forming a massive, glowing arm-cannon of condensed fire and arcane energy.

You fire a high-pressure blast of superheated flame in a straight line (5 ft wide, 60 ft long) or at a single target (your choice when casting).

Line Mode:

• All creatures in the line must make a Dexterity saving throw.
• On a failure, they take 4d8 fire damage and are pushed 10 ft away from you.
• On a success, they take half damage and aren’t pushed.

Focused Mode:

• Make a ranged spell attack against one creature.
• On a hit, the target takes 6d8 fire damage, and its armor or natural defenses overheat, imposing disadvantage on its next attack roll before the end of its next turn.

Environmental Effect:

• Flammable objects not being worn or carried ignite. Stone and metal surfaces briefly glow red-hot.

Overheat Drawback (Flavor + Balance):

• After casting Armour Cannon, your internal flames surge violently. Until the end of your next turn:
• Your movement speed is reduced by 10 ft
• You take 1d6 fire damage that ignores resistance (your body venting excess heat)