|'Heavy Tremor' Nova|
|Name||'Heavy Tremor' Nova|
|Romaji||'Jushin' no Novua|
|Light Novel Debut|
'Heavy Tremor' Nova ('重震'のノヴァ, 'Jushin' no Novua) is the Fourth True Dragon, the fourth of the calamities that have threatened the very existence of Earth as a whole. It was presumably killed by 'Silver' Tiamat, the predecessor of 'White' Leviathan, at some point in the distant past.
Nova arrived on Earth at an unspecified point in time in the distant past, possessing the capability to wipe out all life on the planet. However, it was presumably killed by 'Silver' Tiamat, the Counterdragon born to oppose it, through the use of Code Vier, Antigravity.
- Nova's name is derived from the cosmic event in which a cataclysmic nuclear explosion occurs on a white dwarf, causing a sudden and temporary brightening before returning to its original state over a period of time.