Although the level 120 fabled "Operah's Polished Buckler" says clearly that it can be leveled with planar essences, when I go to the chamber to imbue planar essences, only my primary and ranged are options for imbuing, not the shield (secondary).
Thanks for posting this Niami! I am having same issue with Salvesetter's Buckler \aITEM -1441980606 602189508 0 0 0:[Salvesetter's Buckler]\/a I am still farming out the one from Diaku Solo, that one actually imbues/levels correctly.