How to kill King Zelos?

Question

Recently we have tryed to kill this boss, but we ran  out of time.

I wonder if there is a mechanism to deal more damage on it, because by the time we were kicked it was still green hp, almost yellow.

Answer 1

Now I know at least one way:

So, there are 4 mini bosses you need to kill as fast as possible, to gain access to the final room.

You can make them in any order, but this is the recommendations:

   

The strategies to kill them super fast are:

1. Rewar The Bloody:

1. All the team kills the fetters (spectres) of the room in the beginning.
2. The knight can trap it in the west part of the room next to the teleport
3. All the team focus in the boss when it is in its vulnerable form (blue-grey version), it doesn't take sd damage.
4. The fetters that keep spawning must be kill as fast as possible by all the team but the knight because they  become the boss immortal (red version)

           

After killing this first boss, the team splits: a knight with an ED goes for the 2' (the red knight) and the rest goes for the 2

2'. The Red knight

1. It is good if you carry depth galea or helmet of the deep because of the drowning
2. Ignore the summons called the risen soldiers
3. Lure the Vampiric blood summons next to the boss and kill them there
4. Every time you kill one next to the boss it loses hp.

                       

2. Magnor Mournbringer

1. Trap the boss next to the west teleport, and attack it (it doesn't take sd)
2. Ignore the summons risen soldiers.
3. When he dies 4 summons spawn:  You just need to kill them, but watch out because when they die they explode (6k dmg aprox), so low lvls must use energy ring or stay away.

                             

3. Nargor the impaler:

1. Trap him in the middle of the room and surround it (rps, knights and fire elemental summons), and kill it with spells and gfb.
2. When he dies a Regenerating Mass (defiler) spawns, you need to kill it fast or the boss will spawn again full hp.

                               

When you are done, go back to the east tp and enter the Boss tp (the one in the North corridor)

KING OF ZELOS:

1. All the team stays in the centre, away from the straight attacks of the boss
2. The knight keeps it next to a wall, but don't surround it totally because if it happens he will tp himself to the centre of the room. 
   1. He must not step in front of it, because he could reduce his total Hp to 40% of the original for  a while.
   2. If it happens to remove the 'curse' he will have to step in the green teleport, but if he does a strong mob is summon and the boss heals 15000hps.
3. Attack him with GFB. All the team must bring fire damage, so it is recommended to use flaming arrows and bow to deal as much damage as possible.

                

I leave you the link to a brasilian team that did it:

https://www.youtube.com/watch?v=VPHMDWD8IWU&feature=youtu.be

Answer 2

It only takes fire damage, so everyone must bring GFBs