The Psi Index is a system used by the Terran Confederacy and later the Terran Dominion to measure the psionic ability of terrans[1], a PA Profile having to be established within nine months of birth for all children born within the territory of the former[2]. Under the Dominion, the same system was also used to measure the psionic ability of gestalts; protoss/terran hybrid soldiers.[3]
People with low levels of psychic power can often detect its use[1][4], and some can even resist telepathy[4]. A PI rating of 4.5 is too low to reliably project thoughts, and a person with that low a rating is not referred to as a "teep".[5]
The PI score was completely readjusted after Sarah Kerrigan was brought to the new Ghost Program, as she had reached unheard-of levels, forcing this change[6]. With a PI of 10, Kerrigan has the most powerful psi index on record, closely followed by Nova Terra (also with a PI of 10).[7]
Scale[]
| PI | Description |
|---|---|
| 1-2 | No psychic powers. Most humans. |
| 2-5 | Limited powers. Can sense other psionics. Wranglers. |
| 5-8 | Telepathy. "Teeps". Most ghosts fall between 5 and 6. |
| 8-10 | May have telekinesis. "Teeks". Extremely rare.[1] |
Known Ratings[]
- Sarco Angelini (10)[8]
- Sarah Kerrigan (pre-infestation) (10)[8]
- Nova Terra (10)[1]
- Jackson Hauler (8.5, prior to spectre enhancement)[9]
- Agent X81505M (8)[1]
- Colin Phash (7.5)[5]
- Gestalt Zero (7+, after protoss gestalt enhancement)[3]
- Delta Emblock (7)[10]
- Stone (7)[11]
- Kath Toom (6.5 prior to enhancement)[9]
- Theodore Pierce (6)[12]
- Tanya Caulfield (5.1)[13]
- Aal Cistler (4.5)[5]
- Malcolm Kelerchian (3.5)[1]
Notes[]
An adjutant rated the Queen of Blades as a "class 12 psi signature"[14][15]. A gameplay trailer for Heart of the Swarm listed her as a "class 11 psionic"[16]. After being reborn in primal form, an adjutant rated her power as "the highest psi ever recorded" considering it unclassifiable.[17]
References[]
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