Blade and Soul (or short BnS) is a Korean MMORPG with (imo) a big focus on PvP/Arena. What makes BnS so appealing compared to other MMORPGs like World of Warcraft is the the arcade-like movement playstyle with less "point and click" but free target combat style (as an anology more skillshots in League Of Legends vs more target+cast in Dota 2). You're able to dodge, jump and predict your opponents moves which makes PvP so fun and rewarding in BnS.
The game itself is old (4 years) but it has been released and translated (even though still poor translations) for the the western countries on 19th January 2016.
The reason why BnS is so hyped for the western release is because of the introduction of NA/EU servers. BnS relies on reaction based movements and therefore requires to have a low ping/latency which is just not possible if you play on KR/CN/TW servers.
Check out the game on http://www.bladeandsoul.com/en/
and have fun leveling/playing
It might be a good idea to agree on a server for everyone (NA/EU) if people want to play together
Right now some of my Audi friends play on Cardinals Gate (EU), I personally play on the german server [DE] Frostgipfel (EU) because of real life friends but i'm gonna make another char on Cardianals to join my Audi friends
It is still possible to play Arena/enter Dungeons through the Crossserver Dungeon finder if you being end up on different servers but it is not possible to quest/do open world stuff together.