To everyone asking about how to defeat King Calvus, me and another player who got together because we were stuck on the fight, have discovered a strategy that works great for two players:
Let’s call the two players T and R. Player T will go up to where Calvus’s throne is and attack from there while the other player, player R will stay at the main lower part of the arena to keep King Calvus down there and distracted for player T to hit him from afar.
This strategy works for both phase 1 and phase 2, and if one player is knocked out the other will switch to defensive to prevent Calvus from regaining his health back to full and reset the fight if both players are killed. Once the other player is back on the field, resume the strategy. Even if both players have some of the worst magic, this strategy proves to be consistent in my eyes.
Hope this helps y’all who are struggling like heck and forgot to pick a class properly.