May 12, 2020, 01:0405/12/20
No option to add friends in Raid, for now. They might implement this in the future maybe after they think of a reason why we should have friends list, like private chat, play with friends in a dungeon, battle in arena with each other like a duel but without affecting arena ranking, lend a champion to a friend once a day to help your friend in pve battles, etc.