Let's be honest, this happens because the DPS didn't aggro properly and the Tank doesn't even think to protect rearguard. Everyone was given a barrier but none of them think "of fuck, our support can't cast it on himself". If literally anyone stand infront of him, the barrier would've somewhat protected him too. Typical Raid mentality to be too focused on attacking that nobody bothered to rotate DPS and have Tank actually Tank damage. I mean for crying out loud they have 3 support including MC, at the very least 2 of them should've understand, but no. REMEMBER GUYS, FORMATION AND ROTATION.
Well the MC's also at fault, from the previous chapters it's heavily shown that he still don't understand the importance of a support (AKA himself) survival. They should really find a Tank who's job is to protect the MC.
@Serelanordir the game is still pretty active and updated regularly (the devs even mentioned that they're going to add another class) on Japanese, Korean, NA, and SEA server. Chrerry Credits isn't responsible for the SEA server anymore, since Eyedentity is now directly hosting every server. Honestly if you have like a friend or two, it's a great time to play again. Since it's different server now, you'll probably have to start from the beginning, but honestly lvling to end game isn't really that hard since they boosted EXP greatly for early to mid game.