Behaviour: They act similarly to standard Creepers
[Charged State]: They become charged if lightning strikes
Nucleeper: Four-legs, large and clad in metal armor
Nuclear Siren: In a 256-block radius to start explosion
Items: Drop some gunpowders and a Fissile Core
The Nucleeper is some form of highly modified creeper with mechanical and atomic enhancements.
This poor creature seems to be in a state of constant anguish.
This begins with the core of creeper beginning to close, emitting a warning siren sound and bright flashing lights from its glowing green head. Once the core has completely closed, an atomic explosion will appear and devastate the nearby area.