The AoE damage on Aphelios' Infernum Ultimate is well as the potential to CC an entire enemy team with his Gravitum Ultimate makes him really good during team fights (especially in closed and clumped fights). Aphelios excels in extended trades with slight variations depending on his weapon combination. Combined with the sustenance from items and his Severum, he can easily turn the tide of a fight if he manages to survive the enemy's attempt to kill him at the start of a fight.