Reliable sustained trade damage and sustained healing.
Empowered abilities and resource manipulation
Your attacks and abilities send Aery to a target, damaging or shielding allies.
Gain cooldown reduction and max cooldown reduction on your ultimate. This is increased further each time you use your ultimate, up to a maximum.
Gain 3% extra MS. Gain extra AP or AD, based on your bonus MS, Adaptive.
Your first ability hit every 20s burns champions.
+20 Ability Power or +12 Attack Damage, Adaptive
Recover health when you damage an enemy champion.
Heal for a percentage of damage dealt with your abilities. Increases with each unique takedown.
Thanks to Morde's close range and multiple DoTs ([W] and [R]), you're able to repeatedly proc Aery in extended trades for very reliable damage.
Mordekaiser has no mana costs, making his use of a rune like Manaflow Band completely useless. More [R]s from Ultimate Hat means more kill threat and lane pressure damage.
When playing in to high magic damage teams take Nullifying Orb instead.
The bonus Movement Speed from Celerity is especially useful in scenarios for Mordekaiser because a large majority of his damage comes from being able to stick to his target.
The extra bit of Movement Speed from [W] will also grant a little extra Ability Power.
Scorch is a fantastic lane dominance rune that provides a lot of damage for early trades/fights. Look to proc the bonus damage with an [E] every time is comes off of cooldown.
Taste of Blood on Mordekaiser is great for lane sustain when poking and trading and synergizes well Ravenous Hunter and Gunblade healing.
Ravenous Hunter synergizes incredibly well with Gunblade to provide you a ton of healing so that you can continue dishing out damage.