Summary/TL;DR
I originally built this deck with a mind to boost Kwang's lifesteal and boost his damage threat with crit chance and attack speed, but found that it was more suited to other Fighters (Khaimera and Kallari as noted in the comments). There wasn't much in the way of damage resistance, or actual damage so he sat on the fragile side..
My approach changed during the writing of this guide, and takes a bigger focus on attack speed as Gift of Heavens life steal is a set amount, not a percentage of damage, so more hits means faster healing and the longer you stay in the fight
Coming from a caster/carry background this deck is a bit of a bridge between that play style and the role of a fighter
With the changes brought on by monolith it was time to revisit The Swordsman, and quite a lot changed. Whilst there is attack stored and life steal, the deck is now more focus on crit, basic penetration, damage and health regen. Figured Kwang already heals passively in a fight, having regen out of the fight became the new focus.
This build is still very much 1v1, and initiator, a glass cannon if you will, but is now a solid off and safe laner
Abilities Overview
Gift of the Heavens (Kwangs Passive) is going to be what gives you the ability to go toe to toe with other hero's, the more you hit the more you'll heal. It can also be shared to nearby allies as an AOE from your sword.
Speaking of Fury of (R) and Light of the Heavens (RMB) both centre around your sword, either on Kwang's person or in the world if thrown with Judgement of the Heavens (Q or Square), which has the added benefit of tethering the enemy jn place making closing on a caster or ranger much easier, and will become central to your role as an Initiator.
Kwang's ultimate teleports him to his sword before dishing out damage and slow, you can also use this as an escape technique if set up correctly and things turn dire.
Abilities upgrade priority
E > RMB > Q > R
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Abilities Combos
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Early Game
RMB → LMB, LMB, LMB
Early Game this is going to be a good entry into smaller team fights, Gift of The Heavens not only does AOE damage, great for clearing minion support, but temporarily boosts your physical and damage resist before you pound on the enemy.
2. Mid Game (offensive)
Q → RMB → R LMB, LMB, LMB
The aforementioned initiator combo. Pin multiple enemies in place, smash them with lightning then teleport in doing more AOE and slow before carving into the enemy. Be aware that as soon as you hit RMB the tether will break. Make sure you have support, as I mentioned at the start, Kwang hits hard but with this deck won't last long to a focused attack
Alternatively use this in reverse
> 
> 
as the enemy will take the full brunt of your Ult and be slowed to prevent dodging the second AOE
3. Mid Game (defensive)
RMB → Q → R
The planned, or tactical, withdrawal. If things are getting heating and you have a clear shot, you can throw your sword to safety and Ult after it Teleporting out of danger, and hopefully live to heal and return to the fray. Using RMB first gives a bit of hurt to the enemies, and resistance to stave off ranged attacks
Early Game
Though not primarily a Jungler, Kwang can fill the role, and this build lacks a scythe or syphon, so leave the Jungling to others.
I find this build struggles in the Mid, excels in the Carry role in the safe lane, and will hold its on in the Off Lane.
With 
and a Nirvana Stone you'll be able to out-lane your opposition one on one, as your always healing and have early crit chance boost, so they over reach you will get some early kills for the team. Through Trial and Error I've found that instead of leveling 1 card at a time, this build needs to build across then up, by which I mean at least 3 cards then start upgrading. Depending on who I'm laning against its either Offensive Maneuvers or Brightsteel Plate as my second card followed by 
Pendulum of Lords for health and mana boost.
Mid Game
This is when I'll start completing cards for those great bonuses. You'll notice a heavy lean to power and crit chance here.
Think of the old Samurai movies where two combatants would charge past one another and one would fall over dead. That is the inspiration here. You don't want to get stuck brawling, though with a fully upgraded Nirvana Stone and Lantern of Spring you'll be able too.
That's why you go for the 
Blade of Agora next. Max it out and not only should you be criting 70% of the time it'll be for 100% more damage.
It's at this stage that (like a carry) I go out ganking.
Late Game
Late game is where I can sometimes find this deck struggles, it's either tearing up or being outclassed, and I've yet to find the solution. Still great in a team fight, if you get caught over extended you may find you struggle to soak the damage or dish enough out.
Card Build
UNDER CONSTRUCTION
@Lord_Ammanas, Please let me know when you are done and ready to go live with this guide
Will do, thanks a George
@George, all done And ready.
Will add card list once i have access to my pc
@Lord_Ammanas, OK. Going live. I have questions to you though
I'd appreciate you update the guide clarifying those items above.
May i only suggest a change in your wombo combo? for 2 reasons.
1. I have missed my ult numerous times(even when landing judgment) when i use light of the heavens before fury-enemies will use escape abilities immediately so if you break the tether first they will escape often. By switching the order around, you lock the enemy down with slow, and guarantee's you land all your abilities as long as you landed the first one.
2. When you are up close and personal, using light AFTER fury gives you that physical/energy armor for when you've teleported INTO the fray-this is much more effective to initiate when you have closed the gap with your ulty(think of teamfights and the risk of initiation) and are taking damage-instead of doing it at a distance(unless you are of course securing a kill and it's all you need-but that is obvious)
otherwise i like your guide! interested to see more detail when you have the time ;)
(i've seen some horrible pure tank kwang builds bwahah)
To me, this likes like a build that would work better for Kallari than Kwang. I also find that Kwang's damage does not scale all that well, making stacking damage late game not all that useful. I tried this build with Kwang when he first came out, but found it lacking mid-to-late game, as he is a bit squishy. I appreciate you being honest about that tidbit.
I think it is better to stack damage early in the game, maxing out Voidsteel Dagger and Fountain Spike with your first 19 card points. As the match progresses, I've found that armor, coupled Satori Cloak (to shred armor), Stone of Salvation (huge damage bonus), and Traitor's Touch. This gives you the ability to shred armor without wasting points on physical penetration, as well as have a decent amount of damage without being squishy. I've been highly successful with this build, though I still think even it is rather incomplete.
Thanks everyone for the feedback, as the new summary mentions through the few weeks in took to finalise the guide my actual deck and style changed slightly for the above mentioned reasons; ad after watching/versing quite a few Kwang builds that were pretty much soloing lanes
@Lord_Ammanas, that is OK builds and tactics are changing :) Glad to see the guide up-to-dated and looking forward for your further findings about this or any other heroes.
@George, thanks! Sorry it took me so long. Had to do 90% on my mobile
@Lord_Ammanas, wow. That's good to know. We didn't expect anyone is going to do guides editing from a mobile device. Good to know it worked for you!
Hi All, monolith changes are in, the actual deck is yet to be added.
But tell me, how has monolithed changed the way you play Kwang? Or has it not changed anything?
Started at Monolith but play Kwang. Does that count? :P