Raid Season 5 Dark Dragon - DoT Team - with Vivian Rina (Sword Master Story) 

Use the rotation in the video to keep 100% shield uptime.
Light Hera is needed for the final damage reduction buff. If not, use the archer team below instead.
Alternative team:
Fire Rina - Fire Psyche - Rhea - Light Eros - Fire Cain
#swordmasterstory