Dark Arcanum

Dark Arcanum (ダークアルカナム) and Dark Arcanum EX (ダークアルカナム改) are special attacks from Kingdom Hearts Union χ.

Kingdom Hearts Unchained χ / Union χ
Dark Arcanum is a single-target special attack used by the Illustrated Ansem medal.

Dark Arcanum EX is an all-target special attack used by the SN++ - KH CoM Ansem medal.