I didn't find an explicit line for this at a quick glance, just Holmes saying before the fight with Caenis that Fujimaru was "already at their (magical energy) limit" which sort of implies they obviously didn't ascend beyond what they were already capable of, but in the grand scheme of things, it's only logical that the whole thing just faded away because the whole point was that Kirschtaria needed to stay behind and act as the linchpin of his new world and whatnot, so when both he and atlas (who was meant to put down the new texture) disappears, then obviously the effects of their new texture would also disappear.