you have increased constitution and vulnerability to fire

Nuclears mature at the same time as humans but not as long 

nuclears are like well built humans and have the same height and weight 

When you fail a saving throw against disease or poison you can reroll it but you have to use the new roll

when you die or as an action on your turn you can blow up killing you but dealing 20d20 fire damage to everything in a mile radius and then for 2d20 days the area deals 4d4 damage per turn and if they die they become a zombie under its control and anything in the area for 24 hours turns into a shambling mound 

you can read speak and understand common

you can read speak and understand common