The Wyverns in this area drop Giant Scales. You will need one to reach Monarch Linn, two if you want to activate the geomagnetic fount. Be careful of the Blazedrakes, as they will sight aggro at any level.
Travel westward to the Unstable Displacement at (G-7)/(H-8) and trade a Giant Scale to it. Continue northwest to the Spatial Displacement at (F-6).
To unlock the geomagnetic fount, continue southwest and enter the Spatial Displacement at the tip of (E-7), then trade your second Giant Scale to the Unstable Displacement in front of you, then continue south through the next Spatial Displacement until you find the Stone Monument. The fount is just behind it.
Enter the Spatial Displacement on the southeast side of (E-7). Monarch Linn is just ahead.
This battlefield is no longer level capped. Any solo-friendly job setup can handle Ouryu with ease. If you are attempting this at a lower level, it is recommended to bring 2-6 Mistmelts. These can be obtained via the Fly High quest.
Buffs will wear off upon entry.
The time limit for this fight is 30 minutes.
Ouryu is immune to earth-based effects and spells.
Ouryu will give up at about 30% health, meaning you need to inflict approximately 6000 points of damage.