User blog comment:Crimson Storm Mich/Future Units Preview v2/@comment-27362456-20170426025651

I just found this interesting, but I believe the 4 Predecessors of the Divine Ten's SBB's are their weapon's names

Zelest - Ocean Spear Trisarva 

Ragla - Sky Hammer Yupherias

Agnea - Imminent Flame Aluegar

Daros - Gaia's Edge Algabud