Abyss tower is new system in kr server. You need to check the condition for 3 stars in each level such as: win in 3 mins, no 7k or emperors in your team.. Each stage you will receive a star point if you successfully complete its objectives. You get 3 tries each day including retries.\r
At the end of the season, you exchange your star points for an Abysmal Pit Treasure box (The more star points you have, the better the treasure box).