Against mordekaiser, Ward your flanks as Mordekaiser may try to attack from the side in order to get on a high valued target with his Ultimate R.

If Mordekaiser misses his E in a team fight, it wouldn’t be a bad time to focus him down as he will be unable to pull your team in when his E is on cooldown.

Avoid starting major objectives like the Baron or a Dragon when Mordekaiser is nearby as he can take your Jungler into the Shadow Realm with his R which will make taking the objective risky. Against mordekaiser, Ward your flanks like Mordekaiser can try to attack on the side to get on a high-value target with his Ultimate R. If Mordekaiser misses his E in a team fight, it would not be a bad time to focus it because he will be unable to shoot your team in when his E is on the cooldown. Avoid starting major goals like the Baron or a Dragon when Mordekaiser is nearby because he can take your Jungler into the Shadow Realm with his R that will make it take the risky goal.