wanted to ask some questions about duoble slyphs:

1.Maybe someone know formula for damage calculation in combined dmg ?
2. Can Loki use skills apocalyptic judgement and light of inspiration delphics ?
3. When upgrading loki to odin ur skills will reset or will be the same before upgrading? coz they are expencive!
4. Do u rly get 8 randoms skills? Coz i saw that after upgrading u always get the same set of skills.

If u know the answers or know some wiki sites plz share them. Thnx for info and sorry for my english.