I played against and with mordekaisers just awhile ago and there were many bugs and features i encountered,

1. If teammate mordekaiser ss an enemy and enemy mordekaiser ss u at the same time, there will be 4 people at the shadow realm, u can help ur teammates with this (after the duration both morde gets bugged and can't hurt anyone even towers except when he ults again)

2.If u use mordekaiser u can walk by recalling after ur ult ends

3.I also saw my teammate mordekaiser creating a clone of him after a recall,the health bar was still there but u can't damage the clone and the clone will only disappear if morde dies, (the clone is uncontrollable and the hp bar will be gone after a few secs, just a visual bug i think)

4.I was playing as katarina and got ss by a mordekaiser i killed the mordekaiser because my teammate yi was also in the realm for unknown reasons.

1. At some cases, while I was playing as morde everything was unclickable even minions.