Korinna and spellcasting

[Ornedan]

In what ways can a unit gain access to spellcasting?
Specifically I'm wondering about the Korinna the Foo variants. The Protector and The Red Lady both have traits related to spellcasting: access to Twincast promotion and being forbidden from gaining Channeling I, respectively. Both of which imply that she could somehow gain Channeling I, but that's not on the available promotions list of any of the Korinna variants, so is there some other mechanic to get it?

 

[odalrick]

She used to be able to upgrade along an adept line, back in the beginning of time. It's remnants from that era.

 

[Cado913]

The last time I played Scions, the Black Lady cleared several dungeons. Every time She found a mana Deposit in that manner, she learned the first level spell of that element. That might just be a bug though.

 

[Valkrionn]

No, that's just an effect of that exploration result. It's not specific to Korinna.