Many people underestimate swain top. due to his healing however, he can easily out sustain most top laners. With this build you can unleash the true power of swains Demonic Ascension to shred your enemies health and send them into retreat. I hope you can fun with swain top.

Passive Ravenous Flock
Swain can periodically target a nearby immobilized enemy champion to rip out a Soul Fragment from them, dealing 20 − 105 (based on level) (+ 30% AP) Ability power magic damage and pulling them towards him.

Enemy takedowns will also leave a Soul Fragment behind.

INNATE - FLOCK: Swain's ravens harvest Soul Fragments for him, Heal power restoring 4% / 5.5% / 7% maximum health. Swain can store up to 5 Soul Fragments in reserve, which empower Demonflare.

Q: Death's Hand
Swain unleashes five bolts of eldritch power in the target direction, dealing magic damage to the first enemies they hit. Enemies can intercept multiple bolts, taking bonus damage.

Bolts that kill their targets continue onward and restore 3% maximum mana. This can repeat indefinitely until the bolts reach their maximum distance.

MAGIC DAMAGE
55 / 75 / 95 / 115 / 135 (+ 40% AP)
BONUS DAMAGE PER BOLT:
15 / 20 / 25 / 30 / 35%
EFFECT RADIUS: 725
ANGLE: 45°
COST: 65 / 70 / 75 / 80 / 85 MANA
COOLDOWN: 7.5 / 6.25 / 5 / 3.75 / 2.5

W: Vision of Empire
Swain summons a demonic eye at the target area, revealing it for 2 seconds, which explodes after 1.5 seconds, dealing magic damage to all enemies hit, halved against minions, and slowing them for 2.5 seconds.

Enemy champions are revealed for an additional duration and have a Soul Fragment ripped from them.

REVEAL DURATION:
4 / 5 / 6 / 7 / 8
MAGIC DAMAGE:
100 / 150 / 200 / 250 / 300 (+ 70% AP)
SLOW STRENGTH:
25 / 35 / 45 / 55 / 65%
TARGET RANGE: 3500
EFFECT RADIUS: 325
COST: 70 / 85 / 100 / 115 / 130 MANA
COOLDOWN: 22 / 21 / 20 / 19 / 18

E: Nevermove
Swain launches a demonic wave in the target direction, dealing magic damage to enemies it passes through.
Upon reaching its maximum distance, the wave returns to Swain, detonating at the first enemy hit, dealing magic damage to all nearby enemies and Root icon rooting them for 1.5 seconds.

MAGIC DAMAGE:
35 / 70 / 105 / 140 / 175 (+ 25% AP)
TARGET RANGE: 850
EFFECT RADIUS: 100
COST: 60 / 65 / 70 / 75 / 80 MANA
COOLDOWN: 13 / 12 / 11 / 10 / 9
DETONATION DAMAGE:
35 / 45 / 55 / 65 / 75 (+ 25% AP)
MAXIMUM DAMAGE:
70 / 115 / 160 / 205 / 250 (+ 50% AP)

R: Demonic Ascension
Swain frees the demon within for 12 seconds, gaining bonus health.
While is active, Swain drains the 3 closest Sight icon visible enemies to him, prioritizing champions, dealing magic damage to them each second, and Heal power healing himself for each enemy hit, reduced by 80% against minions and monsters.

MAXIMUM DAMAGE:
420 / 600 / 780 (+ 170% AP)
HEAL PER SECOND:
20 / 35 / 50 (+ 16% AP)
After Heal power restoring 125 / 300 / 450 health with , Swain can end its effects early to cast Demonflare , and automatically does so at the end of its duration.

If Swain dies while is active, he loses all of his stored Soul Fragments. If Swain dies during the channel time of , the cooldown and all Soul Fragments are fully refunded.

BONUS HEALTH:
150 / 275 / 400
DAMAGE PER SECOND:
35 / 50 / 65 (+ 14.167% AP)
MAXIMUM DAMAGE:
420 / 600 / 780 (+ 170% AP)
HEAL PER SECOND:
20 / 35 / 50 (+ 16% AP)

second cast of R: Demonflare


Swain releases his stored Soul Fragments, dealing magic damage to all nearby enemies based on how many he accumulated.

DAMAGE PER FRAGMENT:
45 / 60 / 75 (+ 21% AP)
MAXIMUM DAMAGE:
225 / 300 / 375 (+ 105% AP)
EFFECT RADIUS: 650
COST: All SOUL FRAGMENTS

Aftershock grants you that burst of defenses and damage whenever you use Nevermove which is a lot considering it is you primary poke in lane

Bone Plating grants you more durability in lane, while making all-ins easier

Chrysalis grants you a health boost early game and some AP late game

Unflinching swain is VERY slow so this runes bonus Tenacity is welcome due to the abundance of CC in the top lane

Manaflow Band grants you more mana, ensuring you do not have to recall as much

Absolute Focus grants you bonus AP when you are at full health, which you should be from all the sustain

Rod of Ages is an extremely necessary item for swain, like any mage top laner, as it grants a large amount of health, AP, and Mana (500, 400, and 100 respectively) at a low cost

Spirit Visage is basically necessary on top lane swain due to the valuable stats in grants as well as the increase in healing (note that you need to buy Rod of ages first to get the stacks earlier)'

Zz'Rot Portal grants you the ability to leave you lane as the voidlings will auto-shove it. the stats and MS are respectable

Zhonya's Hourglass grants you armor and AP, but those are insignificant compared to the active. since your ultimate remains active during the Stasis, you can heal back some lost health on top of the other benefits of the Stasis

Banshee's Veil allows you to block one ability every so often on top of the MR, AP, and CDR it gives. this is immensely useful as it allows you to be more aggressive without fear of retaliation

Remnant of the Ascended is really only if you are unable to get CS due to an oppresive lane, or if you are roaming a lot to help other lanes, or if you are just really bad at CS'ing. buy Ancient Coin early to soften a bad lane and then upgrade it if you complete the quest

Redemption is if you want to play a more supportive role for your team. the heal from this is boosted immensely by spirit visage.

Luden's Tempest grants AP and CDR, as well as a good waveclear passive

Void Staff AP and magic penetration both of which benefit swain

Morellonomicon grants AP, magic penetration, and grievous wounds on your attacks to force your opponent out of lane

Archangel's Staff with the amount of mana you are getting from this build you will be getting a decent chunk of AP from this

Rabadon's Deathcap this is a must get when you hit late game as it will cause your AP to skyrocket

Passive:
this is the main sustain factor in swains kit. The Damage is decent and it synergies really well with other teammates if they have CC. If you have max soul fragments you should probably ult when the option comes up

Q:
Your main poke and damage. if you see a lot health minion that is all that is separating you and your opponent, you should Q the minion to hit the Enemy with a very low mana cost.

W:
You can use this for scouting out epic monsters, or you can make use of the double damage on champions and chain it with CC. This is your main Utility tool. Use it wisely.

E:
Your only engage and hard CC, If you can hit the returning strike yo can combo E-->passive-->W-->Q to deal tones of damage. Make sure that nothing is behind your target,as that can really ruin your day

R:
This is you main teamfighting damage. don't make the mistake of rushing for the recast, wait for the ult to naturally end unless you are about to die. it is best to use this when you ahve at least four soul fragments

swain can be played support with these items
Remnant of the Ascended, Redemption, Rod of Ages, Spirit Visage, Zhonya's Hourglass(or Banshee's Veil), and Zz'Rot Portal or Void Staff

as swain you are an aggressive support who drags his opponent to his ADC before unleashing your abilities upon them

here is the build link
https://www.mobafire.com/league-of-legends/build/-537554?revision&nocache

as swain top you are a terrifying Demonic warlord who rains death on your enemies throughout the laning phase. get into position and wait for the right time to unleash a well aimed Nevermove to snare the enemy. once your foes are in your grasp, open a Vision of Empire over them, before sending them into retreat with Death's Hand. Set you plan's in motion by gathering Intel with Vision of Empire. use the burst of vision it provides to scout out objectives with ease. Death's Hand can decimate unimportant roadblocks to victory effortlessly, freeing up more time to advance your plan. When the time is right, move into the final stages of your plan and unleash a Demonic Ascension. the mere sight of this terrifying monolithic demon will send your enemies into a hasty retreat. ensure they do not escape by dragging them back with Nevermove and blasting them with the slow from Vision of Empire. blast out Death's Hand whenever possible to forge an endless stream of damage. As your ravens begin to arrive, hungering for the flesh of your foes, unleash a powerful Demonflare and claim victory for Noxus and nothing more.