View source for Reactive Stealth (3.5e Variant Rule)

=== Changes to Hide ===
The following text replaces the check description from the hide skill:

:You may make a check to prevent creatures who are unaware of your position from seeing you. The DC for this check is 10 + half the creature's level or CR or 10 + the creature's spot modifier, whichever is higher. Creatures who are aware of you or who have been alerted to your presence add +5 to their DCs. You may not take 10 on this check, nor may you retry it. If multiple creatures could spot you, you make one check and compare it to the DC of each individual creature to see which ones fail to spot you. You do not need cover to make these checks. 

:Success on this check means that the creatures do not see you and remain unaware of your location, unless they would be alerted to it by some other sense. Failure on this check means that the creature spots you and is alerted to your position. Once you have been spotted, you may not hide from a creature again until you have broken line of sight with them.

:You suffer a -5 penalty to this check if you are moving faster than half your speed, and a -20 penalty to this check while you are running, charging, or attacking (including sniping). You gain bonuses or penalties to this check based on size as normal.
Author	Tarkisflux +
Identifier	3.5e Variant Rule +
Rating	Unrated +
Summary	Revised rules for hide and move silently checks that make them success checks rather than DC setting checks. +
Title	Reactive Stealth +