[HELP] Confused about Less/Elder Charms and Mogu Runes of Fate

[Dvorjak]

Wowhead says to speak to Elder Liao (Horde side) to convert Lesser charms into Elder charms, but he only offers Mogu Runes of Fate.

How do I get Elder Charms? Should I convert my lesser charms into elder or mogu?

How do I get the key with that you can access a solo instance in shado-pan assault camp for elder charms?

[Prokne]

You get the Key to the Palace of Lei Shen from rares and troves on the Isle of Thunder. They drop from other mobs too but the chance is really low. Ive also had them drop from snails in ToT.

You get Elder charms through the scenario that the key unlocks. You also get them from using the incantations of deng/vu/haqin and killing the summoned mob. The weekly quest only gives Mogu Runes now so there is no way to convert lesser charms into greater ones.