Predecessor Builds > Serath > Painful cudgel penetration

Your crest is Judgement - the best one for bruisers and almost all melee champs with physical damage.
1st item pick lifesteal component from Nightfall for early sustain in jungle.
2nd - Deathstalker is your scaling attack speed. You will build more pen and will have more attack speed later game. With full build you will have +34 bonus attack speed - its like a full AS item bonus. Also it has nice armor shred that you can stack easily with your Q to deal with tanks and bruisers early game.
3rd - VANQ is your main damage dealing item. Vanq is great coz it activates execution from burning dot of your ult/orb.
After you have your attack speed and main damage items complete its time to build sustain. For that you finish Nightfall and build
4th item Draconum. Together with Nightfall it synergizes absolutely perfectly with serath skills for chain kills. It is especially great against squishy team comp - theyre fast to kill, fast to reload your skills and fast to give you chain shield from nightfall + heal from draconum. Also Draconum amplifies the healing effect from the Judgement very nicely.
5th item is secondary damage - Infernum. Activates fantastically from your pulsing ult damage and burns people around even harder and could activate Vanq execution even if your target manages to run away with low HP. Also together with Draconum it gives you good amount of cooldown reduction.
6th item depends on what you need more. Usually i build Perforator if i see armored tanks or Citadel if i myself need a bit more health + armor. Also sometimes i build Absolution when facing heavy CC comp.