Morph (formerly Transform) is a spell in the Dragon Quest series.
Whichever ally the spell is used on allows the caster to take on the attack & defense power, as well as the abilities of the target.
The spell is also a fan-favorite when used by enemies, as the beasts' sprites are replaced with those of the targeted hero and thus provide a rare glimpse of the main characters in mid-battle.
The spell is used by Eliza to pose as The Hero so that he/she won't be killed by Psaro the Manslayer's army. She demonstrates the spell earlier in the Prologue in the Sony PlayStation and Nintendo DS Version, in which she turned into a frog & rabbit.
The Hero can also learn it at Level 30, but only in the NES Version.
The mirrors display a character's over world sprite in the SFC and thus have not attack animations, but were given very detailed and smoothly animated sprites in the DS remake.
Admirers and Knight shifts make use of the spell in both versions of the game. In the original PSX, a static sprite would be utilized while a moving 3D model would appear in the 3DS version. In either case the transformation would only reflect the character's default appearance and disregard vocations and equipment.
A young girl in Alexandria expresses an interest in mastering the spell (referred to in the game as Transform), despite Jessica recommending her to focus from the bottom with simple spells like Frizz. If she's visited later, she will demonstrate being able to use the spell, but not being able to control the results easily as she wanted to become a Hammerhood, but turns into a Rockbomb and then a Walking corpse before reverting back.