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From the Comprehensive Rules 4.0:

At the start of the regroup phase, for each of your characters who has the muster keyword, you may discard a card from hand, then draw a card. You must discard all at once.

If you have two muster characters, you cannot choose to discard a card, draw a card, then discard another card and draw a card. You must instead choose to discard 0, 1, or 2 cards, then draw that same number of cards.

Muster is a Loaded Keyword that first appeared with the release of Shadows as a cycle of new keywords including Toil and Lurker. It applies to characters, but may be granted by a item or condition.

Cards that have or give Muster often are powerful cycling tools, and often are used in decks that either need to construct a hand to kill with the shadow or large decks that need the cycling.

Loaded Keywords
Numeric Damage + X Defender + X Ambush X Hunter X Toil X
Non-numeric Aid Archer Enduring Fierce Lurker Muster Sanctuary Ring-bearer Unhasty
Item Class [Classless] Support Area Armor Brooch Box Bracers Cloak Gauntlets Hand Weapon
Helm Mount Palantír Phial Pipe Ranged Weapon Ring Shield Staff