For raid special for R5 you normally want to have a 2 man front line and a 4 man backline. The frontline shuld constist out of 2 tanks. Dias or Darion are perfect. The other one can be the fire Panda. In the backline you want to have 1 dd 2 healer and a cleanser. Xiao lin (water Kfg) or Argen (wind Vampire) are good dd because they deals more dmg when the enemy got more dbuffs also hwa is a good dd. For a healer colleen is a must have because the heal+Atk Buff and all the d Buffs. Also Chasun, Bella and Emma are usable. As a cleanser you can use Delphoi, Lisa, Raviti and Konamya.