Larkeicus will summon golems to attack, one of each type, but by drawing them closer to him when they explode, he will be stunned for a few moments. The player can increase the amount of time by freezing him. Casting Barrier (Fire + Clear) will negate his Curse-inflicting attack as well.
He can scratch with his claw arm or send dark energy through the ground to flip and Poison targets. His dark sphere attack now splits into five spheres that spread out and inflict Blind or release the energy into the sky where it rains down inflicting damage and Curse.
Before Neo Larkeicus casts a spell, use the Haste effect that Clavats, Lilties, and Selkies get for charging their focus attacks, and move out of the attack radius.
The player can cast Blizzard to give a few moments of free attacking time. Larkeicus will cast Firaga, Blizzaga or Thundaga and his casting ring is quicker as well. If he doesn't cast these spells, he will summon special crystals to cast Fire, Blizzard, or Thunder. Neo Larkeicus takes reduced damage as long as a crystal is around.
Occasionally he summons an arm which have access to the same magic as the smaller crystals, but can also make a character flinch by hitting them or knocking them away by smashing the ground. This is the best time to destroy the weaker crystals. If two arms are still on the field he summons a massive crystal beast which has Curse and Bioga and it may try to release a small energy wave to stop attackers.
Normally, Neo Larkeicus will fuse with the three parts (he is invincible during this time and the smaller crystals don't merge). He will be able to cast the usual magic of the fusees and perform a stronger scratch attack. He slams the ground sending the player air born where his hands grab them and leave them in front of a crystal beam. This attack is highly damaging but easily avoidable. It also exposes the beast's weak spot, which if hit will cause it to shatter like glass. If he begins merging, the player should try to break it apart again, as this stuns him for a short time.