Use the Ice Cone dropped as a platform, or triple jump accross, while clearing the minions along the way.

At the beginning of the fight, and every once in a while in Fire Phase, the queen will unleash 8 tracking laser to everyone that leaves burning ground. While this is scary, players can just stay in mid-air and DPS the boss, the laser only do damage near ground. If players are not confident in staying mid-air (double jump height), feel free to run around to prioritize survival.

Meridia occasionally select 4 random people (2 pair) and skill their skills, leaving only ultimate and pet skills. The boss then put 2 bombs with 2 symbols that can only be damaged by the sealed people with their respective symbols, which is determined from the position before starting the raid. It's recommended to save up Ultimates, or even Pet skills, to break these bombs whenever it come up. Failure to break the bomb result in a wipe.

The boss gains raise the sword upward and create a golden glowing circle, indicating 3 slash big AOE in front of the boss that leaves burning ground. Do not stand in front of her, or just time the dodge.
Staying in air (double jump height) also allow players to dodge the slashes entirely.

At around x910 HP, the boss will teleport to middle and seal everyone's skill. The boss then put up Hexagonal burning area in the middle, and 5 outer area, which are blocked by fire wall which go up and down periodically. There are 4 bombs spawned, which each pair have to deal with, Rook and Pawn will spawn in the middle, and Bishop and Knight are random between the 5 outer area. While this is happening, the boss will spawn tracking laser and periodically close the area with burning ground, indicated by big red AOE on the floor.
To solve this effeciently, when the boss teleport to middle, players should have a pair of Bishop + Knight on North side, and Bishop + Knight on South side. These 4 players should be the strongest DPS in the team because they have to look for the bombs and potentially have to solo it. Since Rook and Pawn always spawn on middle, it's easier to coordinate the 2 pair. Since the middle area is always burning, the pairs have to go in to Awakening + Pet skills, and get out. Clearing the 4 bombs will remove the fire walls.

At around x750 HP, the boss will move to middle and become invincible, spawning either 2 Leotid, or 2 Pawn, and teleporting 2 random people to the Chessboard. The Leotid/Pawn cannot be damaged until the 2-man cleared the chessboard. On the chessboard, there's 2 type of chess pieces, big or small, if it's Leotid, destroy the big ones, if it's Pawn, destroy the small ones, or just destroy all. In the chessboard, the 2-man cannot use any skills, pet skill, and ultimate, only basic attacks. To resolve this, if there's no voice chat, the boss will always have a unique dialog to indicate the boss spawned. For pawn, "Even the lowliest servant have their day. Thunder, protect the king!". For Leotid, "Where the King's Cavalry goes, the iron hooves shall trample. Where rebels hide, they shall meet the spear's end!". There's 40 second timer to defeat these bosses or meridia will wipe everyone.
Upon clearing the chessboard, the bosses can be damaged and will do a mechanic. For pawn, it will be shield-broken after casting 8 lightning which chase everyone. For leotid, the boss have to be tripped over. For pawn, we recommend players to try coordinate the 2 pawn to be close to each other while waiting for the chessboard. For Leotid, we recommend players prioritize tripping over DPS.
Clearing this mech indicates the start of Ice Phase

During Ice Phase, all queen's attack leaves ice trail which continously damage players, and can freeze players if hit too much. The boss will spawn Seal Bomb similar to fire phase. It's recommended to save up Ultimates, or even Pet skills, to break these bombs whenever it come up. Failure to break the bomb result in a wipe.

Similar to Front Slash on Fire Phase, but this time the boss will usually do it 3 times in a row. Do not stay in front of her, or perfect dodge it. The slash will leave continous DoT Ice Trail.
Staying in air (double jump height) also allow players to dodge the slashes entirely.

The boss will teleports away and her sword will glow pointing downwards, striking a huge shockwave accross the map, dragging anyone caught within. To avoid this, always make sure to stay close to the boss whenever the boss teleports to be ready. If too far, prepare to triple-jump and time the dodge.

The boss sometime will spawn Ice Cone, which will chase players before dropping. This Ice Cone will explode after a while. Players chased by the Ice Cone should move away and drop it away from the boss before going in again.

The boss sometime will spawn Icebolts that spawn multiple ice portal around every player and shoot icebolts at the ground. This mechanic can be easily avoided by staying mid-air (double jump height) as the bolts only strike the ground, or dodge and run.

At x510 HP, the boss will teleport to middle and seal everyone's skill. But this time everyone will be teleported randomly, and 4 bombs will be spawned in middle, therefore no need to mind the position. Everyone will be blocked by Ice Wall, which can be jumped over with triple jump, or wait for the Ice Cone to fall down to use as a platform. Do not overlap the Ice Cone because it will destroy each other. In the middle area, there will be 4 bombs which players have to destroy quickly. The boss will keep spawning Ice Cones and Icebolts (if too slow).

At x250 HP, the boss will move to middle and become invincible, spawning either 2 Polones, or 2 Ophelia, and teleporting 2 random people to the Chessboard. The Polones/Ophelia cannot be damaged until the 2-man cleared the chessboard. On the chessboard, there's 2 type of chess pieces, purple glow or orange glow, if it's Polones, destroy the orange ones, if it's Ophelia, destroy the purple ones. In the chessboard, the 2-man cannot use any skills, pet skill, and ultimate, only basic attacks. To resolve this, if there's no voice chat, the boss will always have a unique dialog to indicate the boss spawned. For Polones, "Dynasties shift, but the royal capital shall remain eternal. The chariot shall crush all heretics!". For Ophelia, "Underworld shades, hearken to your king's words. Darkness and silence, be the eternal law!". There's 40 second timer to defeat these bosses or meridia will wipe everyone.
Upon clearing the chessboard, the bosses can be damaged and will do a mechanic. For Polones, both of the boss will start doing 2 laser beams, this move can be avoided by triple jumping the overlapping laser, or tank it with awakening animation. For Ophelia, remove every fireball beforehand, before it turns into permanent purple fireball.
Clearing this mech indicates the start of Dual Phase

At the start of Dual Phase, and until next phase at x100 HP, the boss will spawn specific set of moves. The boss will spawn multiple ice cones, and transform into fire phase. The boss will then create fire walls with burning ground in the floor. To avoid this, make sure to climb on to the ice during the mechanic. Ranged player can damage the boss if close enough, and Melee player can damage the boss by staying mid-air (double jump height) throughout the mechanic.

At x100 HP, the boss will enter the final mechanic. HP will be locked for a while, and the boss will spawn an opposing element clone. Players have 40 second to defeat the clone, or be wiped. During this mechanic, both boss can use all their normal moves. If player have low revive count, it's recommended to kill the clone first. If player have lots of revive and good DPS, can go kill the boss right away. The most dangerous mechanic during this if Ice boss/clone use "Shockwave" from far away, always keep watch of what the other boss is doing.
The boss will summon the clone again if taking too long to finish the fight.