Board Thread:Game Discussion/@comment-130.14.254.26-20130708130531/@comment-2067839-20130709205016

To get enough materials to craft the "plus" version without summoning, you need to kill the boss up to level 43. Level 60 will give enough materials for two "plus" versions. (It changes to dropping 2 per kill and then 3 per kill at appropriate levels to make this work.)

The summoned bosses are always level 1.