Editing HorizonVirtual:Executing Rewrites (section)

=COMBINING REWRITE EFFECTS=
Rewrites or rewrite effects usually work as described, no matter how many other rewrites or rewrite effects happen to be operating in the same area or on the same recipient. Except in special cases, a rewrite does not affect the way another rewrite operates. Whenever a rewrite has a specific effect on other rewrites, the rewrite description explains that effect. Several other general rules apply when rewrites or rewrite effects operate in the same place:

'''Stacking Effects:''' Rewrites that provide bonuses or penalties on attack rolls, damage rolls, saving throws, and other attributes usually do not stack with themselves. More generally, two bonuses of the same type don’t stack even if they come from different rewrites (or from effects other than rewrites; see Bonus Types, above).

''Different Bonus Names:'' The bonuses or penalties from two different rewrites stack if the modifiers are of different types. A bonus that isn’t named stacks with any bonus.

''Same Effect More than Once in Different Strengths:'' In cases when two or more identical rewrites are operating in the same area or on the same target, but at different strengths, only the best one applies.

'''Same Effect with Differing Results:''' The same rewrite can sometimes produce varying effects if applied to the same recipient more than once. Usually the last rewrite in the series trumps the others. None of the previous rewrites are actually removed or undone, but their effects become irrelevant while the final rewrite in the series lasts.

''One Effect Makes Another Irrelevant:'' Sometimes, one rewrite can render a later rewrite irrelevant. Both rewrites are still active, but one has rendered the other useless in some fashion.

''Multiple Mental Control Effects:'' Sometimes rewrite effects that establish mental control render each other irrelevant, such as a rewrite that removes the subjects ability to act. Mental controls that don’t remove the recipient’s ability to act usually do not interfere with each other. If a program is under the mental control of two or more programs, it tends to obey each to the best of its ability, and to the extent of the control each effect allows. If the controlled program receives conflicting orders simultaneously, the competing controllers must make opposed Charisma checks to determine which one the program obeys.

''Rewrites with Opposite Effects:'' Rewrites with opposite effects apply normally, with all bonuses, penalties, or changes accruing in the order that they apply. Some rewrites negate or counter each other. This is a special effect that is noted in a rewrite’s description. 

''Instantaneous Effects:'' Two or more rewrites with instantaneous durations work cumulatively when they affect the same target.