You learn to gather and store excess power for your Breath Weapon over time.
Whenever you finish a long rest and you still have a use of your Breath Weapon available, it grows more powerful. Add 1d6 damage to the roll for the Breath Weapon the next time you use it. This bonus stacks with each passing long rest, up to a maximum of 10d6 total damage. Beyond this point, the Breath Weapon continues to gather power uncontrollably, becoming more dangerous to the targets and the user. For each following Long Rest you don't use your breath weapon, the damage dice grow stronger but you deal damage to yourself as well when you use it. After one additional rest, it deals 10d8 damage to targets and 2d8 damage to yourself. After two, it deals 10d10 damage to targets and 4d10 to yourself. After three, it deals 10d12 damage to targets and 6d12 to yourself, and you begin to take 1d4 damage of the breath's type every minute. You cannot benefit from the effects of a short or long rest while taking this damage. Once you use your Breath Weapon after it has overcharged any amount, you cannot use it again until you finish a long rest.
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