[This content is for mid/late-game players, like who wants to craft Homunculus or Reappraisal stones.]

This is the most easier Beast in the game. He will grant “Soul Chain” to one of your monsters. This effect will completely exclude the target from the battle. It will be removed when you hit the boss a designated number of times.
You just need to multihit as Hell.

FRONTLINE:
Colleen + a multihit Damage Dealer with sustain, like Chamie, or an other multihit Attack buffer like Fran or Hwahee (that’s why he will apply Soul Chain to one of your front liners, and if he do this on Colleen, for a few turns you will don’t have Attack buff.

BACKLINE:
Absolutely the Blue Twins if you have, Kung Fu Girls (Xiao Lin and/or Fei), Raoq, Shihwa and/or Lushen. Grego and Verde are good units here, but not essential.

Have fun!

[This content is for mid/late-game players, like who wants to craft Homunculus or Reappraisal stones.]

The Light Beast casts a shield that decreases the received damage and increases the inflicted damage. This shield shares the damage inflicted on the Light Beast and substantially decreases the inflicted damage when receiving multiple hits.

FRONTLINE:
Obviously you should use colleen, because you need Attack buff. You don’t really need other supports, just BIG single target damage dealers. As second front liner you can use Mei Hou Wang, Xing Zhe, Laika or other DPS that don’t get oneshotted.

BACKLINE:
In the backline you should just go with non-multihit Damage Dealers. The best mobs for this role are: Lyn, Brandia, Luna (Dark Pierret), Bethony (Dark Magical Archer), Mara (Dark Amazon), Lushen, Perna ecc.

Just pump up your damage and you will have 0 issues.

Good luck

Raid 5 is a very difficult content, you will need good runes too, not just the right mobs.

For a safe (lie, in R5 nothing is safe), but not to slow team you should use:
1) One Damage reduction unit (like Dias, Darion, or Def+ buff)
2) One/Two Cleaner. One if it has the skill every 3 turns (like Kona, or Anavel). If you want to be safer put in a second one (like Lisa or Amarna) even if it has 4-5 turns CD.
3) Attack buff. Use Bastet or Colleen because she puts Atk- and Uncoverable to the Boss. Debuff are very important here!! (remember that if you use Bastet you needs one more healer on the team).
4) Damage Dealers based of Harmful effects are the best here (like Brandia and the Xiao Lin), but Fei, Hwa, Mei Hou Wang are good units too for Raid.

FRONTLINE:
Dias/Darion (at least 1 set on revenge runes, 70% resist HP DEF DEF/HP).
Bastet/Colleen (don’t need violent runes, just very fast and tanky SPD HP DEF/HP).
Xiong Fei/Mei Hou Wang (if you use this front, put the front unit with less Def in Backline)
Cleaners:
If you use Bastet –> Anavel/Amarna (if you have) and Kona 
If you use Colleen –> Kona/Anavel/Amarna (if you have) and Lisa/Dona(light penguin)

BACKLINE:
Hwa, Brandia, Xiao Lin, Fei, Homunculus Wind and/or Cadiz.

In R5 the Leader skill used are: Def, Resist, Rate.
So if you have Dias/Praha, Baster/Xiong Fei/ Mei Hou Wang and Hwa in your team, you will not have problems.

Good luck and have fun.