Instructions
Find two Alloyers at towers 18, 20 and 21, fight them and then use the "Catch" option to capture them. Train each Alloyer by fighting other monsters until it reaches level 10 and evolves into Metar.
Find and capture two Arachnes at towers 20 and 23. Train each Arachne to level 10 to receive two Ashras.
Fuse one Ashra and one Metar together to form a Gance by highlighting the two monsters and choosing the "Fuse" option on the main menu.
Find and capture two Suovenirs at towers 17, 18 and 19, basements 17 through 20 or basements 47 through 54. Use one DoubleSpeed item, which is attached to one Suovenir, on your newly fused Ashra and Metar monsters.
Capture two Barongs at tower 16 or basements 30 through 34, and then fuse one of the Barongs with the Gance to form an advanced Arachne.
Fuse the second pair of Alloyers and Arachnes, and then give them the "DoubleSpeed" item. Fuse the other Barong with the Gance to form another powerful Arachne.
Fuse the two Gances together to receive an invincible monster named S-Gance.