Sorry guys do not have a pic/or video that can be of reference however, I am unable to flawless the dungeon because the stairs bell inside the Vault encounter is bugged.
For some odd reasons when I dunk 1 symbol and get ready to leave the bell kills me to TP - I have even put a bubble or titan wall around it so adds do not shoot the bell when I am trying to use it but the bell still kills you.
9 flawless attempts....
Death by bell only :(
And it only happens in the vault!
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Same with me, though i am not sure its a stairs bell only one that kills you. And i am not even close to bell when i shoot at it, usually i am on the other side of the room.