Things You'll Need
Instructions
Walk to the Calm Lands and go to the east of the fenced area, until you reach the Monster Arena. Talk to the master there and accept the quest to begin capturing fiends for him.
Capture one of each type of fiend across the Calm Lands. Once you have successfully done this, return to the Arena Master, and he will reward you, as well as offering new weapons for sale.
Purchase the special Capture weapons from the Arena Master for all of your characters. If you cannot afford the Capture weapons for every character, buy them for three characters, and then only fight with those three characters.
Go to Mt. Gagazet and the Cave of Gagazet and capture one of each type of fiend there. Here is the list you will need: Bandersnatch, Ahriman, Dark Flan, Grenade, Grat, Grendel, Bashura, Madragora, Behemoth, Splasher, Acelous, Maelspike
Return to the Arena Master once you have completed your capturing mission, and he will reward you with the Blossom Crown. This will allow you to open the door in Remiem Temple.