Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
COCKROACH BUILD, INDESTRUCTIBLE TANK! YOU CAN SURVIVE 1V5 WITH THIS!!!!!
Do you like never dying, and do you like it when your team wins? Then try out this build. Warning, you won't get a massive ammount of kills, but you will be able to take damage from 5 enemies for around 7 seconds without dying. I don't feed once in most games with this build, it's good for taking the attention of all enemies so your allies can destroy turrets.
So, essentially what you want to do is start with Regeneration pendant, straight into phil stone, then get heart of gold. This accelerates the hell out of your item build, giving you a huge advantage over everyone else, especially because early swain is a ****ty farmer.
Now a huge thing with swain is to always have blue buff as often as possible just for pushing/tanking with his ult.
HERE'S THE CORE BUILD:
After getting those two initial items just follow one of the three builds (or mix them as your please) depending on the enemy team setup.
But honestly, you just won't die, it'll piss the enemy team off once you hit level 6. Also this makes Swain a great team player because you can always hang out with "that one guy" that feeds all the time. His abilities let him prevent enemies from killing your allies, you take so much damage and just never die.
But seriously, this is the most fun build I've ever had, so many won games with this!!!!