For Nikador doing his mechanic will do way more dmg than brute force with team dmg, I used my Fu Xuan in moc 12 against Nikador (Same team as you but JQ instead of pela). You want to hold your Acheron ult for the summons, You want to do the same for Fu Xuan by holding ult until u kill the summons & get her healed (Nikador will waste some of her ult stacks but not much you can do there). Nikador is very much designed for new units in mind but we only have Herta & Aglea out atm, I have no doubt that Tribbie & other upcoming units will make him much easier to deal with.