Renna's Rise is a Location in Elden Ring. Renna's Rise is one of three towers found in the Three Sisters sub-region of Liurnia of the Lakes. 

It is accessible after giving Ranni the Fingerslayer Blade. A waygate to the northern part of Ainsel River is found at the very top.

This tower can be accessed by progressing through the Ranni the Witch questline. This Tower can be accessed once players reach the Divine Tower of Liurnia as part of Ranni's quest. This occurs after defeating Radahn and giving the Fingerslayer Blade to Ranni. After this, players can make their way and take the ladders to the top of the interior tower. There will be a chest that will contain the Snow Witch Set. Map Link

If the barrier is still there after completing the quest with Ranni, you'll need to visit a Site of Grace to reset the area.

During the questline, you may also gain access to the portal located at a higher part of the tower. Go through the arched doorway out the tower after using the ladders to climb. Take the stairs that wrap around the external part of the tower and there will be a portal that can be used to travel to another location.