We have determined that there is an error on the in-game banner for the Descended Time Attack . The in-game banner incorrectly states that there are no Egg drops in the Descended Time Attack  dungeon.
Currently, the following two monsters can be earned as drops in the dungeon:
Boneclad Dragonbound, Hermé-Ra
Boneclad Dragonbound, Hermé-Ku
*Dungeon clear results will not be affected due to these monster drops and changes will not be made to rectify this discrepancy.
We sincerely apologize for any confusion this may have caused and thank you for enjoying Puzzle & Dragons.