Head behind the temple of Avalon and find Elda. then follow the key words until she changes the cape for you.

List of items to achieve the Cape :

• 1 Cape of elf (droped by the liche zo)
• 1 ring of lion
• 1 Gladiator's Ring
• 1 Seraphin Luck Ring
• 1 Bible Cantique
• 1 Hat of Madrigan black
• 1 Hat of Madrigan blue
• 1 production kit

Reward :

 Cape of Heigt Elves (With boost)