Mastery 6-7 Tokens forging question

I did see you can forge them with blue essence, champion's shard or permanent champion, what is this last one? Blue Essence: You get them by destroying champions shard Champion Shard: As skin shard, you get them from chests or from the champion shard token Permanent Champion: What is this? For example, I have Ashe mastery 6 and 3 tokens for Mastery 7 Ashe, ofc I have Ashe permanent, how does it work now?
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