Focus is an extension of the basic concentration mechanic. Through meditation and self-reflection, you have expanded ability to concentrate your mind beyond normal limits.
At rank 1, you gain 1 Focus, and 1 more each rank thereafter.
Think of Focus as extra concentration slots. With 1 Focus, you can concentrate on two powers at a time.
Many psionic powers require concentration. Some require multiple slots of concentration, and will be listed as "concentration (2 slots)" or similar.
Some psionic powers have powerful modes of operation that require expending Focus. A power that expends n points of Focus reduces your Focus by that amount. So, if you have 2 Focus, you can expend two 1-Focus powers, or one 2-Focus power. In fact, you can overextend, expending your baseline concentration stat itself, leaving you unable to concentrate on anything.
If a power expends Focus and requires concentration, you must have enough unexpended Focus or baseline concentration to maintain the power after expending.
Some psionic powers require you to be in a "Focused" state. This means you have at least one unexpended Focus (not your baseline concentration).
There are rank 0 powers in every school that help you gain Focus. You can also use the Meditate action to enter a Focused state:
''Meditate'': At-will, std; you meditate, gaining 1 Focus, or restoring your baseline concentration if expended.
At-will, swift; you mark your place in space and time. Record your position, HP, conditions, etc. Later, you can use recall: Recharge 33%, swift, you rewind time to the Marked position, affecting only you.
Free; you immediately take a single action out of the flow of time. (Time Stop rules). One round per encounter per rank above 2.
[Portal][Portal]
[Time Warp][TimeWarp] (time hop, etc)
[Warp Bubble][WarpBubble]
Space warping as a means of dissolving molecular bonds
Example ([Portal][Portal]):
At-will, swift, concentration; you create two portals, both within line of sight and effect. Each is linked to the other. Whatever passes through one comes out the other, with momentum intact (relative to the portal). The portals are large enough for a projectile, a Tiny creature, or a Small creature using Acrobatics.
When using a single-target psionic power, you can affect an addition target for each available Focus. If expending, you must also expend Focus for each additional target.
