Pros:

- Strong Sustain after first item with the combination of these runes
- Very tanky for what you build
- Extreme amounts of damage after 2+ items
- No mana = more time in lane

Cons:

- Very slow without passive proc and these runes
- Kited very easily by some champions
- Meh early game
- Struggles against mobile ranged matchups

Passive - Darkness Rise

Mordekaiser gains a medium sized circle around himself after successfully land 3 attacks or abilities on enemies which deals magical damage equal to 1-5% of the enemies health per second + 8-25 magical damage and 0.3 of his ability power while also gaining 3-9% bonus movement speed.

This also gives Mordekaisers auto attacks additional magic damage equivalent to 40% of his ability power.

Q - Obliterate

Morde will smash the ground with his hammer dealing the base damage + 60% of his ability power to all enemies within the hit area. If it hits a single target the damage is increased by 30-50%.

W - Indestructible

Morde will shield himself for 30% of the damage he deals and 15% of the damage he takes. When Morde activate Indestructible a decaying shield that lasts for 4 seconds is created that can shield Morde for 5-30% of his health. Morde can then recast Indestructible to consume the shield and it will heal him for 40-50% of the shield amount.

E - Death's Grasp

Morde will send out a claw which will grab enemies within its radius and pull them towards him dealing base damage + 60% of his ability power.

This also grants Morde between 5-25% passive magic penetration depending on spell level.

W - Realm of Death

Mordekasier will target a champion and slow them by 75% and after 0.5 seconds will send them into a 1v1 small area with him and will not be able to escape for 7 seconds. Morde also steals 10% of the stats during Realm of Death and will keep the 10% stats he stole if the enemy dies until they respawn. Other champions and minions can not help in Realm of Death, but turrets can still hit both players inside.