Talk:Ludger Will Kresnik vs The Fafnir Knight/@comment-25275196-20160802063722/@comment-25275196-20160809000229

Lore-wise, the Ur-Child is one of the overlord's failed experiements. Although, it became a monster that surpassed even the overlord in terms of power. Whether or not it surpasses the Yggdrasil Core remains to be seen, but it supposedly has god-like powers. In battle, it is impossibly tough, being able to kill you in an instant even on the lowest difficulty, and has so many special abilities to turn the fight in it's favour. Not to mention that it looks cool.

In answer to your question, it's a completely different entity to the Yggdrasil core, and can only be fought post-game, unlike the Yggdrasil Core in TMG, which was the 6th stratum boss. I'm not sure if it holds any creditable information, but it certainly seems powerful (although, considereing a non-fafnir party can defeat it, it's probably not that powerful.  If I were you, I'd base most of the powerscaling off of the Yggdrasil Core).