It's in the Danger Room rulebook, at the bottom of page 13:
Rule of 3
Many modifiers can affect combat values during the game. Because all modifiers are cumulative, a special rule called the “Rule of 3” places a limit on how much a combat value can be modified. The Rule of 3 states that no combat value can be modified by more than 3. For example, if the combat value is 3, it cannot be modified to more than 6 or less than 0.While the effects of powers, team abilities, battlefield conditions, and feats override standard HeroClix rules, the Rule of 3 takes precedence over all those effects. Replacement values are not subject to the Rule of 3.
Quote : Originally Posted by Sigdr
An interesting question. My immediate response is that I don't like you very much.
One thing that we should all remember regarding the "rule of 3" and how it applies to damage value is this (since it comes up often):
When using an object w/super strength, the object adds to damage dealt, ergo it is not subject to the rule of three. FYI
In other words, you can perplex up a characters damage by three, say Magog, from 5 to 8, and then he can pick up the soda machine (which adds 3) and if he hits he would deal 11 clicks of penetrating damage (thanks to his Exploit Weakness).
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Also damage from getting knocked off a roof or into a wall
Except that is techincally separate from the initial damage. Meaning, while your Hulk might get clocked for 5 by a Pouncing Spidey with a heavy object, the additional 1 or 2 damage dealt from the knockback that Spidey rolled would occur after the 5 damage... and if a damage reducing power or Combat Reflexes happens to be on the dial after taking those first 5 clicks, the damage dealt from falling off a building/into a wall will be reduced/ignored.
"How does [insert special power] work with the new 2013 rules?"
Most everything special power-wise, we're looking into. The PAC changes may change the way some special powers function; we're checking on them before the June release. In the meantime, ask your judge.