Final Fantasy XV No Pain, No Gem; however, requires you to finish Reliable Royalty and also to unlock the northern area of Cleigne.
This particular dungeon is a key-location for No Pain, No Gem side quest, and the following walkthrough will explain why.
Before entering the dungeon, though, talk to Dino in Galdin Quay, and start the No Pain, No Gem side-quest. As Dino reveals during the cutscene, he needs a Ruby Stone to craft his next jewel.
The Ruby Stone, as you’ve probably guessed, it’s in Myrlwood. Keep in mind that the recommended level for this dungeon is 35.
If you are ready to explore it, head to the entrance located south-west of Vesperpool.
Objective: Obtain a Ruby Stone
To find the Ruby Stone for Dino faster, keep an eye on the mini-map the moment you enter Myrlwood. While this dungeon may look confusing it is quite straightforward.
All you have to do, is to stay close to the left side of the dungeon when you reach the first clearing.
The Ruby Stone, as you can see in the picture above or in our video walkthrough below, is at the edge of the first large area you explore.
Again, you will have to look for a gray deposit with red insertions. When you find it, simply pick up Ruby Stone x 1, then exit the dungeon.
Objective: Deliver the Stone to Dino
Fast travel or drive back to Galdin Quay and show Dino the Ruby Stone you just collected for him. The wannabe jeweler will be very surprised to see that you made it back in one piece, and will award you with a Ruby Bracelet.
Furthermore, the final quest from Dino’s questline (A Treasure Beyond Measure) is also unlocked after you complete No Pain, No Gem.
No Pain, No Gem Quest Info
Description: “Hoping to hone his craft, Dino needs another raw gem for use in a new piece. Unfortunately, the stone he seeks can only be found in a danger-laden location, and Noctis once more finds himself taking up the search.”
Reward: Ruby Bracelet x 1
Post Quest Suggestion
Complete Fishing, Naturally side quest.