PSI is a key game mechanic in Mother 4. They are moves used by the player characters or enemies that use Psychic Points (PP) to bring about various effects in battle, or in rarer cases, in the overworld. "PSI" is an abbreviation for "psionics" and refers to the psychic powers a player character or enemy has. Three player characters in Mother 4 are able to use PSI: Travis, Meryl, and Leo. PSI abilities will vary between different characters; for example, Travis is the only player character able to use Telepathy. Each PSI move has its own name and individual effect; however, a PSI move with the same name can further be divided into "power levels," indicated by Greek letters (α, ß, etc.). PSI is divided into four categories: Offense PSI, Support PSI, Recovery PSI, and Other PSI.
Offense PSI deals damage to enemies or the player characters and may induce secondary effects.
List of Offense PSIEdit
|PK Fire||α, ß, γ||Meryl, Leo|
|PK Freeze||α, ß||Meryl|
|PK Thunder||α, ß, γ, Ω||Meryl, Leo|
|PK Beam||α, ß, γ||Leo|
Recovery PSIEditRecovery PSI serves to restore the player characters' or enemies' HP or PP, or to remove status ailments. Often, Recovery PSI can be used both in battle and in the overworld.
List of Recovery PSIEdit
Support PSI moves allow the player characters to buff themselves or debuff the enemy in some fashion, without directly dealing damage or affecting opponents' PP. Enemies can use them as well--buffing themselves and debuffing the player characters. Support PSI are called "Assist PSI" in the official Mother games.
List of Support PSIEdit
PSI in the "Other" category can bring about effects in battle that can't be placed in the other three categories. Often, they can be used both in battle and in the overworld. Overworld uses are as follows:
- Telepathy - Allows Travis to read the minds of non-player characters and receive alternate dialog.
- 4th-D Slip - Allows the user's party to access places that would be inaccessible otherwise.
List of Other PSIEdit