Pun enjoyers should probably be advised that 'Treasured' or another synonym would probably work better than sticking stubbornly to Precious. You have the nigh-infinite space of language to play with! Don't limit yourself!
e- someone preempted me!
[X] Treasure Garden Preservation
I did like the Primordial Boreal Bastion, except that -al occurs twice, there are three labials, and the word stresses are all bunched together for a very chewy effect in the mouth. 'Hoary' would be a good alternative to Boreal, perhaps, given it also has age connotations. But it also sounds like 'whore' so maybe not. 'Atavistic' or 'Foregone' might also work. Atavism as a 'return' to a previous form is very good here I think. Hoary Bastion of Foregone...something. Dreams, perhaps. Foregone Years. Atavistic and Hoary Bastion. Foregone Heart. Primeval Hoary Bastion. Foregone Boreal Bastion. Something like that. Bastion of Boreal Atavism, maybe. Atavism of Boreal Memory. I'll propose those ones.
[X] Primordial Boreal Bastion
[X] Bastion of Boreal Atavism
[X] Atavism of Boreal Memory
I do agree that the Pillar itself is of minimal importance to LQ, so I'd rather focus on the immediate environment that she used to adapt Kohatu's memories to her own experience.
e-this one's pretty great!
[X] Evergreen Succession