Between the foul fire.
Berseria floor 2 ex dungeon.
In a bush near the narrow pathway to the exit.
The extra dungeon can only be unlocked after beating the final boss of the story.
How to find the ex dungeons guys i did not finish the game yet.
The hardest difficulty chaos is unlocked by beating a crystal code red boss that reflects damage either set it on simple or use your own reflect from.
They are meant to test the player s battle abilities with strong opponents many of them being cameos of playable characters from previous entries in the series and often contain.
Heal so you can restore physical strength and create a warp here.
Do this on normal never go to simple as enemies lose their weaknesses resulting in a major dmg loss for you.
Don t touch the foul floor.
Beat this basilik and proceed to the area where you could find katz.
Right in front of the ember on the stairs not hidden at all.
No kats floor 2.
In the same way as before in places such as the ruins you must pay a dark fire.
I forget but i think its close to your spawn floor 4.
In the side room straight ahead of where you spawn floor 5.
Just to clarify this early for you the very 1st floor with the 3 enemy spawns do not have a katz to increase the timer unlike the floors after that.
For tales of berseria on the playstation 4 a gamefaqs message board topic titled ex dungeon guide.