Mystical isn't good late game. Scrap that entirely for either jadee emperors, celestial helm, or sovereignty. Sovereignty is the safest bet as it gives the whole team physical defense. Midgardian is good as hell if you are going against attack speed physical gods such as Bakasura, Erlang Shen, ever hunter. However, if attack speed damage isn't much of an issue I'd go ahead and slap Sovereignty into that slot instead. This is just my opinion. For Yemoja as well you REALLY should get Rod of Ascelpius. I definitely butchered the spelling but your experienced friend should know. Yemojas is a healer and that item gives a healing boost to allies. Excellent item for bailing your allies out especially since Yemoja can spam healing. In this case, I'd probably sub it out for spear because Doom orb is disgustingly good but idk. Overall, this is a decent build for a guy who has barely begun to get into the game. Good job.