Devourer Arahakan is probably the easiest Raid Boss. Hell Raid and Normal Raid Mechanics are similar. The only key difference is that the minions in Hell Raid does a lot more.

Keys to Defeating Devourer Arahakan
Kill minions. The faster players can kill minions, the easier the fight becomes
Cleanse Defense Break, these are applied by the minions' normal attack
Put Buffs and focus on killing minions when Corrupted Web is available because Arahakan doesn't take as much damage when Corrupted Web is available.

Put Defense Break on Devourer Arahakan and try to deal more damage to Devourer Arahakan when Corrupted Web is on CD

Minion's CD skill heals the minions or the Boss (whoever has lower % health)
Recommended Team Compositions
Must Haves
AOE Damage Dealer (AOE means the hero has skills that can hit multiple target)
Healer
Cleanser
Good to Have
Defense Breaker
Single Target Damage Dealer (if you can kill Minions fast)
Example Teams
Arbiter Vildred : AOE Damage Dealer
Vildred: AOE Damage Dealer
Falconer Kluri: Defense Breaker
Angelic Montmorancy: Cleanser and Healer
All these roles are very flexible as long as your gears are ready for the boss. So try to use Heroes that you already use or are planning on using in other contents.
This concludes our Epic Seven Hell Raid Devourer Arahakan Guide.
See other Raid guides here
All other Epic Seven guides here
Epic Seven made easy by Sez Gaming, Until next time!