Ragnarok Ground Zero/Instances/Strategy-Celestial Void

The strategy is...

Requirements:
 * Must have completed Endless Tower once
 * Must have completed Banquet of Heroes

Strategy:
 * 600+ STR/INT/DEX should be optional but 1000+ is top priority.
 * Have at least 20-30 party members, because it's very dangerous instance. Bring ranged attackers like Genetics, Rangers, Warlocks, Sorcerers, and such. Also have tank with very high VIT or AGL like Asura (formerly Sura), Royal Guards, or Mechanics. Bring nukers/DPSers like Rune Knight with elemental dragon breaths (never use it on Gabriel Celeste). Always have supporters like Archbishops, Maestri (3nd class of Clown), Wanderers to give buffs to party members. In case of death, bring Ygg. leaves. Face the ghostly Doppleganger-like clones of fictional (and copyrighted) characters in fan-sprite form from different franchises. All of them are boss-flagged, because you cannot use any status ailments OR Sense on them, and their health bar is not displayed.
 * When fighting ranged attacker characters, make sure bring out equipment with cards with ranged damage reduction from them. (for example, GX must use cross cutter on Duke/Henry Fleming/Soldier-76. Sorcerers should cast Psychic Wave plus Earth Grave.). Pneuma is the best defense, watch out so these enemies can push them back unless they have Strong Shield equipped. Bring out Wanderers/Maestri here to boost ATK/MATK/RATK whatsoever.
 * When fighting melee attacker characters. Ranged attackers must keep from distance. (have Geneticists use Cart Cannon if necessary.
 * When fighting hybrid characters, be very careful! Royal Guard with Shield Spell is a good choice.
 * On a final battle with Gabriel Celeste and Ethereal Queen, bring out Cursed Waters and have Priest Classes or higher cast Aspersio, OR ranged attackers should bring Silver Arrows/Dark Arrows/Shadow Cannonballs/Holy Cannonballs.
 * Must bring a charm that equips in inventory of misc, it gives stat boosts.