Radiated. The Young Radiation Dragon has an immunity to radiation and nuclear damage, and heal for the amount of damage dealt to them by either source.
Multiattack. The dragon makes three attacks: one with its bite and two with its claws.
Bite. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 19 (2d12 + 6) piercing damage plus 3 (1d6) radiation damage.
Claw. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 15 (2d8 + 6) slashing damage.
Radiation Breath (Recharge 5–6). The dragon exhales irradiated isotopes in a 30-foot cone. Each creature in that area must make a DC 17 Dexterity saving throw, taking 63 (18d6) radiation damage on a failed save, or half as much damage on a successful one.
Description
Dragons being territorial creatures defend their lands to the death and refuse to abandon it. When heavy radiation leaks into a dragon's territory, sometimes the dragon mutates from it as opposed to perishing. These dragons are even more formidable than their non-irradiated counterparts, and the area around them can be just as dangerous.
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