An 7.2-7.5 Speculation

[Cleretic]

Calyx knows he’s from Reflection 9, and seems integral to creating “Solution 9.” If he knows his Reflection’s numerical designation, then he knows the others - which could mean he’s got a Solution 1, Solution 4, Solution 8, Solution 11, and possibly a Solution 13. Whether he’s put them into play yet is another question…

Solution Nine is named that because it's on the ninth floor. This was literally the very first thing we were told when we entered Solution Nine.

Given that, actually went to 'Solution Eleven' in the base expansion--it's where we beat the snot out of Zoraal Ja--and know that 'Solution Twelve' and onward does not exist, because the twelfth floor was an organizational code name for the portal to the Ninth above the 'throne room'.

We've also been to the eighth floor in literally this patch, it was where one of the Arcadion raids took place.