Prevent

focus prevent
Syntax: focus prevent  where setting=({very low,low,average,large,very large,enormous}) e.g. : focus prevent low Note : With careful study of psionic energies, you learn to detect great impacts that may be life-threatening. Through extreme cost, you are sometimes able to react to dodge these attacks. By setting your psionic prevention threshold, you set the damage amount of any single attack that would trigger your response.

Psionic prevent is a dodge type power that detects the damage of an incoming attack, tests it against the configured threshold, and then attempts to dodge the attack if it is over that threshold. It is not as finely configurable as bubble, which is similar in effect, but it is more effective and much cheaper. The control cost is notable, and it costs around 20 sp per dodge, so when solo it is sensible to set the threshold as high as possible to conserve resources.

This synergizes well with overload and perceive to make sii extremely sturdy for very short periods of time.

In parties, it can effectively turn large hp damage into a much smaller and more steady sp drain. If possible it is best to have healers ready to heal your hp as well, as the dodge does not always succeed making sii fairly "spikey" in their defenses. Sii regen is significant, so if the failed dodges are spread out enough self healing can recover. Due to the control cost, if this is being used for full on tanking, the sii will need a steady supply of large corpses to envelop.

Presumably the "perception" mind skill which appears at glevel 10 is related to this skill. I am guessing that the skill makes the dodge more likely to succeed since the power fires 100% of the time the hit threshold is cleared as far as I can tell.