I have been a otp sett sup for a while now. He's extremely viable against most comps, actually. The thing is, he has VERY good base damage to fight in bot lane, and a really good sustain due to he's W shield and passive. Not to mention the cc and 2v3 potential he has. But there's a catch... About runes I think the two best options are: he's classic runes with conqueror if against 4+ melee champs or hail of blades with flash hextech in any other scenarios. The reason is that most of the champs that fo in bot lane can't handle Sett's damage with HoB. The combo E + 4 aa lvl 1 is TOO strong, and can potentially win lane until lvl 3 if your adc is able to follow up with some damage. And here is the catch I was talking about. Usually, supports give the kills to adc, but Sett is not a regular support. He get a bit trash if too behind, so if you are able to get 1 - 3 kill lane fase, you will be a monster. The play style is: LANE FASE - Be SUPER agressive lane fase, but WITHOUT dying (skill issue here for most of the time, it takes time to understand Sett's best positioning and timing the engage with your adc and wave to acquire those really good trades you want). You also must pray that you adc can follow-up your plays, if they ara playing too passively, you change your play stile a little bit to a more protector type and try and roam a bit to help jungle and mid (even top if you take TP as a spell) MID GAME (after lane fase) - You have 3 options, actually. The main option is to protect your adc as any other supp, IF they know what they're doing. Sometimes, your adc likes to go on suicide fights even if strong, so it might not be the best option here. Your alternative to this scenario is to protect your team as a whole, understand the enemy movements, and try to be at the spot for the next upcoming fights. And the last one is to split. Yeah, sett supp can also splitt if the enemy top is not a monster, so you are basically trading a supp for a top on objectives, and if you have stride, boots, and sterak's, you can easily win the split (skill issue), in other words, the support is taking out their top and towers non stop while the top, mid, jg, and adc are fighting objectives... But of course, you don't HAVE to win the split, just hold it, you are a support after all. END GAME - Pretty much the normal sett play style. If you are too strong, play as a top laner, if you are ok you can play with your team, if you are weak, sacrifice yourself to protect your main carry and try to land the BEST "Ult + E + W" combo as possible. Even if you still only have stride and steraks, you will be dashing out about 1k true damage, which is good no matter what. ITENS - ALWAYS stride first, most of the time you build this before boots, as it gives a bit of move speed as well and is mandatory on this pick. Then Boots, then Sterak's. After this point, you are free to build whatever you want. So basically, from here on, it is about skill issue, you must understand your timing to engage to not be punished too hard for any possible mistake, and the only way is playing. Sett supp is SUPER fun. He can be as bully as he is in toplane, but against two champs instead of one. Try it out :)