1) That seems fine so far. The 30-50 SMN quests seemed to show there were a fair amount of soul stones around. Access to someone with some good archeology skills possibly required. (But who's to say there isn't someone with a family heirloom or something?)
2) I can't remember if someone screencapped the section for it, but when I was reading the lore book, it had a good soul stone piece. Basically, while a soul stone contains all those memories and experiences, a person can't just grab one and know everything. IT still takes work, study and training to tap into the potential stored in them. (Think of it as resonating with the stone). In that sense, yes, it's possible that by putting in enough work, your character could gain access to some of those spells.
3) AFAIK, none. Egi is a word taken from the Allagans that roughly translates to "essence of." So a Garuda-egi is a being that is the essence of Garuda, and so on. Egis are different from say, carbuncles, which are arcanist geometries shaping aether being passed into a gemstone, which then yields the sparkly creatures we all know and love.
2) I can't remember if someone screencapped the section for it, but when I was reading the lore book, it had a good soul stone piece. Basically, while a soul stone contains all those memories and experiences, a person can't just grab one and know everything. IT still takes work, study and training to tap into the potential stored in them. (Think of it as resonating with the stone). In that sense, yes, it's possible that by putting in enough work, your character could gain access to some of those spells.
3) AFAIK, none. Egi is a word taken from the Allagans that roughly translates to "essence of." So a Garuda-egi is a being that is the essence of Garuda, and so on. Egis are different from say, carbuncles, which are arcanist geometries shaping aether being passed into a gemstone, which then yields the sparkly creatures we all know and love.