Board Thread:Questions and Answers/@comment-76.111.238.35-20150614074644/@comment-25209037-20150614094639

Spheres
 * spheers

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Good spheres are subjective, but general purpose spheres like Sol Creators and Amanohabaken can be crafted. Medulla and Legwand are rewards during Frontier Hunter, which is the easier way of obtaining them, or you can craft them from Randall sphere section, a more tedious route. Unique spheres like Demon Core is awarded when you gain Hunter Ranks.

Some spheres are seasonal spheres like Paskuan Weapon Enhancer and Advent Solace, meaning either their materials can be only obtained from seasonal vortex (Easter dungeon and Christmas dungeon in this case).

Others are rewards from Grand Gaia Chronicles, these are the ones you shoud obtain as soon as you can. Some are rewards in Arena as you gain Arena Rank.

For more information, look here:

http://bravefrontierglobal.wikia.com/wiki/Spheres_List

http://bravefrontierglobal.wikia.com/wiki/Arena_Rewards

http://bravefrontierglobal.wikia.com/wiki/Frontier_Hunter

As for the sphere materials, that would be difficult since materials are scattered through out the quest maps and Raids, some are dropped by specific monsters/bosses. It would be better for you to look up a sphere's material, and research or ask where that material is dropped.