page 9 of the rule book

if multiple game effects would allow for damage dealt to a character to be reduced or ignored, only one game effect can activate, to be decided by the characters controling player

what exactly does this mean? & are there any characters that have these game effects

The previewed Brainiac 5, for example, has a power which gives, iirc, Toughness to an adjacent figure. (There are other ways for this to happen, too.)

This rules keeps the reducers from stacking. (IE you can't add a Toughness on top of someone's Invulnerability.)

ok thanx man