Also called "hive mind," this allows the mutant to empathize with creatures of a like nature (same type) or like power (mental control mass mind, telepathy, etc.) in order to amplify the effects of its own powers. Mass mind works in direct proportion to the number o minds participating. A mutant with mass mind and mental bias abilities could get together with another creature with mental bias and, together, deliver a double strength mental blast twice the normal distance.

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