PSI Shield

This article is not to be confused with "Shield."

PSI Shield, written as PSIShield in EarthBound Beginnings, (Japanese: サイコシールド Psycho Shield) is a PSI ability in all three Mother games. It protects a single conscious character, or all characters, from enemy PSI-based attacks, and even returns some of the blocked damage to the attacker at higher power levels. PSI Shield is learned in EarthBound Beginnings by Ninten and Ana, in EarthBound by Paula, and in Mother 3 by Lucas. In Earthbound, some PSI attacks can lower it's defense by 1 (its default is 3) except PK Thunder, which instantly causes it to be destroyed.

Kumatora's body is enveloped by a PSI Shield.

In EarthBound Beginnings

Level	Users	PP Cost	Target	Effect	Description
α	Ninten, Ana	4	One ally	Protects with a PSI shield.	The PSI Shield halves all damage.
β	Ninten, Ana	9	All allies	Protects with a PSI shield	The PSI Shield halves all damage.

In EarthBound

Level	Users	PP Cost	Target	Effect	Comments	Description
α	Paula	8	To one of us	N/A	Dissipates the enemy's PSI offensive attack if it hits at it.	Protects one person with a psychic shield. It blocks an enemy's PSI attack. Using a different shield will cancel these effects.
Σ	Paula, Buzz Buzz	24	To all of us	N/A	PSI Shield covers everyone in the group.	Protects everyone with a psychic shield. It blocks an enemy's PSI attack. Using a different shield will cancel these effects.
β	Paula	14	To one of us	N/A	"Psychic Power Shield." PSI Shield α plus reflection.	Protects one person with a psychic power shield. It reflects an enemy's PSI attack back at the attacker. Using a different shield will cancel these effects.
Ω	Paula	42	To all of us	N/A	"Psychic Power Shield" covers everyone in the group.	Protects everyone with a psychic power shield. It reflects an enemy's PSI attack back at the attacker. Using a different shield will cancel these effects.

In Mother 3 (PSI Shield)

Level	Users	PP Cost	Target	Effect	Description
α	Lucas level 28	8	To one of us	PSI Protection	Halves PSI damage to one ally. Some attacks can't be halved, however.
Ω	Lucas level 35-45	20	To all of us	PSI Protection	Halves PSI damage to all allies. Some attacks can't be halved, however.

In Mother 3 (PSI Counter)

Oh no! A foe's PSI Counter activates!

Level	Users	PP Cost	Target	Effect	Description
α	Lucas level 33	18	To one of us	Counters PSI Damage	Reflects PSI damage dealt to one ally. Some attacks can't be reflected, however.
Ω	Lucas level 53	34	To all of us	Counters PSI Damage	Reflects PSI damage dealt to all allies. Some attacks can't be reflected, however.