The rift is a fairly new discovery inside of Atlantis. In order to get to the portal, go to Abel Coast off of the docks. There is a section of land behind the Crypt where you will find Atlantis Entrance (46,1). To get into Atlantis, you MUST wear a scuba mask or be merfolk. Once you are geared up, head into Atlantis, and step into the portal (30, 28) where Chromitus will greet you and throw you into the rift if you wish. You must be level 500 in order to enter. The level of the map depends on the level of whoever enters the rift first. Mobs can be ten levels higher than you. If you are grouped, only one party member needs to enter the portal.
There is a chance you can enter a rift someone has left as well. So the levels will stay the same as the person who entered first. (Thank you Ermac and Remy!)
Once you enter the rifts, there is no exit (besides scrolling/dying). Rift maps are PvP, so even if you are in a group, you could possibly kill your party members. If you die due to another Aisling, you will turn into a ghost and revive in 5 seconds on the same map.
(2/5/2025)UPDATE: If you die from a mob, you will skull inside the rift where someone on the same map can either rescue you or if you let the timer end, you will appear in front of the totem in Atlantis (Map #188). There is no penalty currently except for losing the rift you just died in. No hell, no pile, no scar. I have tested this today.
Of course, you can take off scuba gear inside the rift, but once you get back into Atlantis make sure you equip your mask again before you start walking or you will start to drown.
Another group could pop up on your map and kill you and race you to the boss. You will revive on the same rift map if this happens. The gear here drops Rare+ so the chances of Legendaries + are higher. So far, I have seen gear and gold drop and a lot of exp gained... BUT, once you kill all mobs, you will now be faced with a boss.
Once more research is done about Atlantis and this portal, I will be sure to update! Until then happy rifting!!
Congratulations to Remy, Ermac, and Aizen for completing a full rift and killing the boss!!!