Bomb Carrier

Bomb Carriers are hostile mobs that usually spawn rarely in all biomes of the Overworld. While alive they place ignited TNT every 8 seconds. Bomb Carriers will only spawn in low light levels.

Trivia

 * The Bomb Carrier is the only mob in Nevermine that creates block damaging explosions, and does so even without provocation.
 * When the game rule mobGriefing is turned off, its TNT will still destroy blocks.

References/Sources
http://adventofascension.gamepedia.com/Bomb_Carrier