It reminds me of old good times in Beyond Oasis: The Story of Thor and its 100 floor dungeon (unspoken/secret quest for Fire Sword) or lovely Star Ocean series and its Cave of Trials labyrinth(s) (there was also 200 floor tower in So3, it was a blast to finish it) or FFX-2 and it's Infinite Dungeon.
I really hope this potential bonus dungeon will grow up into something at last slightly decent as these I mentioned.
O yeahh ! For me the same !!
On 7th of february 2015 : I start a new adventure in the Divinity world of Original Sin, it's a Fantastic Freaking Fabulous Funny ... it's my All Time Favorite One !