Cosmo Fiend: Rosen

Cosmo Fiend: Rosen

Type

Rosen's Cutscene

Description

Rosen is the final boss of Fiend War and the strongest one in Cosmofiend. If he finds a strong opponent, Rosen will personally fight them in his own universe with planets rotating around himself. Using the force of these planets, Rosen split himself into two halves being Black & White Universe.

Move Set

"Everything is my will..."

• Hex Panel Transformation: When all parties in their respective universe enter Rosen's room. he'll transform the ground similar to Executioner Belial's Tile Transformation that lets him use Hex Pillar depending on his hand movement and regardless of what planet phase he's in.

• Planets Phase: Rosen summons four different planets that rotate around him as they are shared among both parties Universe-wise and he'll consume one of those planets that activates a phase with different patterns in a non-randomized order.

• Flame Planet: (Fire Floor, Hex Explosion) Every hex panel that party members step on becomes ablazed, standing on those specific hexes will cause heavy damage similar to a  Burn (Status) effect. At a certain period of time, Rosen can create Hex Explosions from those ablazed panels. Have all four party members spread out in the corners during this phase, use  Leap, keep jumping until the duration wears off and carry plenty of Healing Kits until the phase is over. After 20 seconds, every ablazed hex will explode and all party members should gather in the center once Rosen becomes groggy for 10 seconds.

• Glacial Planet: (Crystal Prison, Ice Spikes) Rosen can be damaged during this phase and cannot become groggy, but keep this in mind that there's a "A cold wind is blowing" gauge appearing above the players' head as it slowly fills up by itself. Using a skill that requires  Clear Cube Fragments will quickily fill up the gauge and activates Crystal Prison which traps players inside and creates Ice Spikes that inflicts  Frozen (Status) to anyone nearby so use  Toy of Sparkling World to negate it. To free trapped players, an empty crystal of the same color will spawn somewhere in the room so break that immediately or else their HP will slowly drain and die from being trapped.

• Transcendent Planet: (Elemental Crystals, Transcendent Hex Pillars) Rosen is invulnerable during this Planet Phase and he'll summon Transcendent Hex Pillars that deals low to moderate damage and can interrupt players. After a few a seconds, Rosen will summon six Elemental Crystals that are spread out across the room. These crystals can be hit and each time this occurs, they'll change the element going from (Fire -> Water -> Light -> Shadow) In order to damage Rosen during Transcendent, all party members must match the crystals to the element that was decided on before entering either Universe. If successful, Rosen becomes groggy for 10 seconds and only takes damages from that chosen element. If the timer gauge fills up and the party was unable to match the crystals, Rosen will teleport to the middle and summons Hex Explosions for awhile until the crystal pattern is re-summoned again.

• Storm Planet: (Hex Tornadoes, White Tall Tornadoes, Small Green Tornadoes, Whirlwind) Another Planet Phase where Rosen is vulnerable as he summons huge tornadoes around the room's edges that must be avoided as those deal heavy damage if caught into one of them.
  • Hex Tornadoes: Like any other Hex Panels, he can summon a wind version of this in random spots of the room.
  • Small Green Tornado: Rosen sends out three waves of these that deal low damage, but strong enough to push players back into the huge tornadoes.
  • Tall White Tornado: Rosen summons four of those to chase after players that can capture and throw them into the room's Hex Tornadoes.
  • Whirlwind: A large green circle appears below Rosen and he creates a whirlwind that pulls in everyone in the center as well as the room edge's tornadoes that can easily kill anyone if not avoided. Recover with Healing Kits or have the Crusader/Enchantress use  Healing Wind/ Regenerative Aria/ First Aid of Love to avoid casualties as Rosen enters his groggy states for 10 seconds before repeating the patterns.

• Standby: (Hex Pillars) If one party only entered The Gate or the last planet is being dealt with by another party, this means there are no more planet phases to fight. Rosen basically transforms the room back to normal summoning dusky hex pillars and remains invulnerable at all times until that party destroys that planet. This non-phase can be useful for players to hard reset if they used up their skills during the fight, but keep in mind there's only six  Life Tokens that are shared for that party so use them sparingly along with the 10 minute time limit.

Once all four planets are destroyed, Rosen enters his main groggy phase and becomes vulnerable as both parties from Black & White Universes have 15 seconds to deal as much damage they can to Rosen in one cycle before the phase ends to clear Fiend War. If either party didn't manage to defeat Rosen, he'll equalize the HP between both universes and starts up a second cycle.

Strategy

• Before entering either The Gate's Black or White Universe, both parties should decide on what element to choose for Rosen's Transcendent Planet phase. For example, if you're the main damage dealer for party 1-4 that wields a high  Water Element attribute and 5-8's main dealer specializes in  Shadow Element, everyone else should switch to that element by using a Cube Contract and selecting a specific cube color.
  • This doesn't bother classes like Elementalist, Elemental Bomber or Sword Master who can use all four elements with their skills, but it's still recommended either way.

• Due to Fiend War forbidding cooldown-related consumables and equipment, hard resetting is the only way for both main damage dealers or Crusader/Enchantress to regain their skills by dying to Hex Pillars and revive with a  Life Token.

• Bring at least two Physical Enhancement Potions for Rosen's main groggy phase and during Rush only if your party was unable to 1-cycle him and starts up a second one.

• Learn one level of  Leap to avoid Flame Planet's Fire Floors. Classes such as Female Spitfire's  Nitro Motor & Dragon Knight's  Dragon Wing can also avoid the ablazed hexes.

• Using  Thunder_Hammer:_Jupiter/ Purifying Lightning is very helpful against Rosen during Storm Planet as it not only puts him in repentance mode for a short peroid of time, but makes the planet's pattern less frustrating.

• If you have a Savior's Triumph Weapon (excluding Crusader/Enchantress), the explosion effect's range could possibly help with the Crystal Prison pattern during Glacial Planet.

• Most parties often skip Glacial Planet due to how difficult the phase is and asks the Crusader/Enchantress to deploy their  Apocalypse/ Crux of Victoria/ Marionette if they get the planet first.

• There are two different tactics that both parties can use when facing Rosen which are Rush & Delay depending on the Planets phases are either in:
  • Rush: First planets normally count during this so clear it soon as possible. If the second planet is destroyed, wait for the other party during Standby.
  • Delay: Chip away at Rosen's HP by using sustained skills, but do not kill him depending on which planet phase he's in since Storm & Transcendent Planet are very time consuming and both phases requires cooperation from either party to make sure either side is prepared to defeat Rosen when he enters his main groggy phase as delaying can be useful for hard resets.
    • But since the planets are randomly picked, both parties can either rush any planet if they are strong enough to 1-cycle Rosen or prefer to delay if one party needs more time to prepare.

Appearances

• Fiend War (Boss)

Gallery

Notes

• Due to high pings and lag, Rosen can suffer from a number of bugs that will not only hamper his fight, but hurts the entire raid's progress as a whole.

Trivia

• Rosen's name comes from Christian Rosenkreuz, legendary founder of the Rosicrucian Order.
• Rosen possibly represents all the elements:
  • Flame Planet - Fire
  • Glacial Planet - Water
  • White Universe - Light
  • Black Universe - Shadow
  • Transcendent Planet - All elements
  • Storm Planet - No element
• There's a joke among the community regarding Rosen's design that bares a striking resemblance to the mascot, Pepsiman.