Guide to acquiring a Lycanus weapon

TRIO
When you kill final lycanus you will have three crystals and you have to talk to them as this picture shows.



When all the chests are down, open them in the order they fall down, be careful they fall down different then crystals are positioned.

When you destroyed all the chests its time for lycanuss chest

Each of three people should have a different color stone


 * red stone: orb/crystal
 * blue stone: great sword/daikatana
 * green stone: blade/katana

The person who has that color should open the chest and then you will get weapon.

PROOFS:

DUO
The only important thing here is that both have same colored stone


 * red stone: orb/crystal
 * blue stone: great sword/daikatana
 * green stone: blade/katana

Just one kills the chest and you will get as written before.