User blog comment:Mich, Michele & Kuhla/Guide: UBB and the OD gauge/@comment-65.74.125.121-20151129223231/@comment-27068645-20151130001909

So when you use normal attack, the OD guage goes up by 500, right? Witch Tale of Honor Elgif fused into a unit, that unit will increase OD guage by 10%-40% more (depends on rarity of that elgif. link for more info. http://bravefrontierglobal.wikia.com/wiki/Gameplay:Elgif_and_Emgif)

So the increase will be 550, 600,650, or 700