I played Mordekaiser and i saw he have some bugs (not serious atm). Those are the bugs i've found:
1) Rift Heralt buff doesnt work properly when Mordekaiser kills an enemy champ with his ult on:
1.- Kill Rift Heralt
2.- Take its buff
3.- Kill an enemy champ with your ult on when you have the Rift Heralt buff on.
Rift Heralt buff should stacks when he moves
Rift Heralt buff doesnt stack properly when you control the enemy champ that you killed
2) Mordekaiser Ult doesnt apply his AP correctly to a killed enemy champ
1.- Get Ultimate
2.- Use ult in an enemy champ
3.- kill enemy champ
The killed enemy champ should have part of the mordekaiser's AP
The killed enemy champ didnt get AP (only 0 ap, no percentatge)
If someone knows another bug post it on coments and i'll edit my thread.
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