One of the many puzzles and side quests found within Elden Ring is located at the Converted Fringe Tower, this seal requires quite a bit of running around in order to solve and remove it. This includes getting the Academy Glintstone Keys and Erudition gesture.
Below is a simple guide on this one..
THE CONVERTED FRINGE TOWER
The Converted Fringe Tower can be located in Liurnia of the Lakes, east of the Frenzied Flame Village. When you arrive you will instantly encounter a seal, meaning for now we cannot gain access to the building. Hmm..
ACADEMY GLINSTONE KEY
In order to remove the seal over at the Converted Fringe Tower we are going to need to collect the Academy Glintstone Keys.
We will mainly need the second key as we already used the first Academy Glintstone Key in order to reach the Liurnia of the Lakes. The second key can be located at the rooftops of the Academy of Raya Lucaria
After getting the Academy Glintstone Key we will now need to pay Sorcerer Thops a visit in Church of Irith.
Sorcerer Thops will be very interested in the Academy Glintstone Keys, this is triggered by continuing to talk to him. You will also need to accept his donation plea.
Anyway agree to give him the Academy Glintstone Key and in return we will be given the Erudition Gesture.
KAROLOS GLINTSTONE CROWN
Return to the Debate Parlor at the Academy of Raya Lucaria. This time ignore the roofops as we need to head behind the building, so head right at the mud mound and continue on past it.
In amongst the tress and bushes here there should be a ghost spirit that sort of resembles a crab, defeat it. It is not really a threat so its not really a fight, you just need to hit it at least once.
Once you have successfully defeated it you will be rewarded with the Karolos Glintstone Crown
RETURN TO CONVERTED FRINGE TOWER
With both the Karolos Glintstone Crown and Erudition Gesture now in our possession we can return to the Converted Fringe Tower.
Here equip both the Karolos Glintstone Crown and Erudition Gesture and head towards the seal. Perform the Erudition Gesture and the seal will be removed.
Once passed the seal continue on and up the stairs. Ignore the strange looking ball of faces, we do not need to fight it.
Here you will reach an elevator, ride it up to the top. Once at the top head outside and up the next set of stairs. We will now reach a treasure chest containing the Cannon of Haima and Gavel of Haima. These are magical spells that can cast projectiles and an attack that uses a magic greathammer