Synopsis: To store one's body in a time-stopped state, but allowing one's mind to be free from the body and able to act. In other words, stylishly masquerade as a magic or psionic item.
Process overview: Separate the mind from the body. Preserve the body. Store the body. House the mind so that it is free to act.
Pros: Able to inhabit any edged metal (host) weapon within a certain radius at will. Able to exist for a few rounds outside of a "host". Can be affected only by a very limited list of effects; for example: effectively immune to all physical and energy damage. Body is immune to at least one (or two) rounds of damage, regardless of type. Effectively disguised as a minor magic item.
Cons: Complex requirements-limited entry. Requires daily (or more frequently, depending on character level) power point expenditure to survive. Cannot benefit from magic items, except for weapon crystals. (which fact went a long way towards placating my dm.) Can still be affected by mental and death effects. True seeing reveals that you are not a minor magic item.
Preparation:
Two to five feat slots filled with Expanded Knowledge Feat (manifester level 3rd).
Glove of storage (2,500 gp) or similar psionic item.
Psychic Reformation power (psion/wilder 4th level power, manifester level 7).
Compression power (psychic warrior 1st level power, manifester level 1-via expanded knowledge feat).
Crystalize power (shaper 6th level power, manifester level 11, must be shaper or use another expanded knowledge feat.)
Quintessence (shaper 4th level power, manifester level 7, must be shaper or use another epanded knowledge feat.)
Steal Steel (psion 5th level power, manifester level 9, unique power-via expanded knowledge feat)
Sufficient ranks of Autohypnosis to set up an unconscious hypnotic command.
Delay power feat if there is any question about the timing of the sequence of events.
Construct body feat or animate object power to activate the glove of storage.
Ring of sustenance to offset any minor quibbles of survivability, especially if the quintessence is canceled.
step one: compression (requires psychic reformation, and exp. know. feat)
this will reduce her weight to below the glove's limit, if augmented for double
reduction.
step two: steal steel. (unique power, must be obtained from dragon in the forgotten
realms setting, or by dm permission/arrangement/fiat. )
this will allow her to escape her body and inhabit an edged weapon.
step three: crystalize.
this will preserve her reduced body and its life functions.
step four: use quintessence on the crystalized body.
this will timestop the duration of all non-permanent effects on her. it will also
serve as a measure of protection against damage, as if the glove is
destroyed, the violence of the gloves destruction would neutralize the
quintessence but leave enclosed items undamaged... till next round.
step five: use glove of storage on the compressed crystalized body.
if there is a question of activation, use psychic reformation to acquire
construct body feat, to wear a construct form long enough to active the glove.
step six: use quintessence on the glove.
this will time stop the duration of all non-permanent effects on her. it will also
serve as a measure of protection against damage, as if the dagger is
destroyed, the violence of the daggers destruction would neutralize the
quintessence but leave enclosed items undamaged... till next round.
step seven: store glove in the handle of the dagger.
since shrink cannot be used on a 'magic item', and crystalize results in a 'magic item', this route will allow the character to exist in the dagger. have the quintessence prepared ahead of time.
Steelsteal
Psychoportation (Dex)
Level: Psion 5
Display: None
Manifestation Time: 1 action
Range: Personal
Target: You
Duration: 1 hour/level or until you return to your body (D) (see text)
Power Points: 9
You free your spirit from your body, allowing you to travel as an incorporeal creature and inhabit metallic blades (such as daggers, swords, and so on). While incorporeal, you cannot make attacks or use any abilities, but you can fly at speed 30 (perfect). You do not carry any equipment with you but gain a deflection bonus to AC equal to your Charisma bonus. You can remain incorporeal for up to 3 rounds in succession, after which the power ends and your spirit returns to its body. When incorporeal, you are affected by spells and powers that ward or harm such disembodied spirits or possession attempts, such as magic circle against evil, which prevents you from entering or attempting to possess any blade within the area.
While incorporeal, you can overlap a metallic blade with your incorporeal form and enter it fully. While "possessing" the blade in this manner, you can see, hear, and feel as well as a normal human. You can speak and use any powers or abilities you have that don't require somatic or material components (therefore psionic abilities function normally). You cannot move the blade unless you have magic or psionics that allow you to move objects (such as far hand, skate, or telekinesis). You can remain within a blade indefinitely, subject to the duration of the power. As a standard action you can vacate the blade and become incorporeal again, or transfer directly between two blades in physical contact at the time. A blade possessed by you can bypass damage reduction as if it had a +2 enhancement bonus, but it does not gain any bonuses to hit or damage. Damaging the blade causes you no harm, and destroying it merely returns you to your incorporeal form. At any time you can end the power as a standard action and immediately return to your body.
If you attempt to possess an intelligent blade, the blade resists and you must attempt a Will saving throw (DC = item's ego). Success means you possess the blade and can use its abilities in addition to your own (so if the weapon could teleport once per day, you could activate that ability and teleport yourself and the blade to your choice of locations). Failure means you possess the blade but cannot use its abilities or any of your own (you are essentially a passenger), although you can still leave the blade normally.
Your body remains behind, unconscious. Effects on your body (such as poison, disease, and so on) continue while you are away, and because your body is still alive, it still needs air, water, and food. If your body is killed, you die.
Note: Another possible DM fiat, but the autohypnosis power could be used to self-program to auto expend the pp on the steal steel power. so long as one does not drop down below the minimum pp required to manifest it for 24+ hours.... I believe that there are other methods to get into an object more or less permanently, but this is one of the lowest level ones I can find.
Also note the unusual level-based duration. This article was published in June 2003, one month before the 3.5 phb was released, and a year or so before the exp psi was released... so this is definitely a 3.0 power.
This combination can render one effectively immortal, so long as the body is not destroyed nor dies, and you are not prevented from manifesting this power in a timely fashion, somehow.