Paragon multiclassing is an alternative to paragon paths for multiclassed characters who have taken a number of multiclass feats.
A character that has a multiclass encounter, a multiclass utility, and a multiclass daily feat (such as Novice Power, Acolyte Power and Adept Power) for a class can choose to continue to gain powers from that class rather than take a paragon path.
Benefits:
At 11th level, character can choose to replace one of your at-will powers with an at-will power from character's second class.
In place of the paragon path encounter power gained at 11th level, character can select any encounter power of 7th level or lower from character's second class.
In place of the paragon path utility power gained at 12th level, character can select any utility power of 10th level or lower from character's second class.
In place of the paragon path daily power gained at 20th level, character can select any daily power of 19th level or lower from character's second class.