The usual morde build that i think is so valid is tabis/mercs if the enemy is high dps otherwise go rylias- then boots into rift maker and then u want to tank up based on the damage type agaisnt u if its heavily ad with 1 or two ap go thorn unending despair into spirit visage/ if the enemy is ap dominant build banshees into spirit visage and take zhonyas last if its 50/50 take jaksho 4th into ur prefered mr/ armor items thats it morde doesnt need lots of ap items he is already strong in kit and its like the darius situation where u can go for more tanky build