|Fire + ???|
|Target||Single nearby object|
|Requirement||Being Vritra + special condition / wielding the Sword of Hellfire + state of Extermination + 0.5% of required vigor is deducted from the summoner's vigor|
|Known user(s)||Agni, Vritra|
|Blog source||Agni's skills|
Fathomless Fire is Vritra's Unique Transcendental Skill. It shifts the target in a 0-dimensional space (note that Hell is 1-dimensional). 0-dimensional space is practically indistinguishable from non-existence, that's why Shiva called this new dimension "being lost".
5th-zen gods are able to escape it by jumping to higher dimensions.
Agni copied this skill a long time ago through his Sword of Hellfire, but couldn't use it as it is a sura-exclusive skill; only after learning the state of Extermination from Taksaka was he able to cast it.
Agni didn't tell the other gods that he is able to use it.