Monsters are generally more powerful than other classes so they have a player to monster ratio assigned to them for how effective they are. Monsters are presented in the Dor Un Avathar, the monster handbook for Amtgard, as well as in several expansion books. You can find an index of those monsters here.
 From the Rulebook (Non-Standard Classes) and from the Dor Un Avathar
Monster is a special class. Credit in Monster can only be taken twice a month, but as you increase weeks in Monster, you increase it for all monsters. Thus if you have 13 weeks in Monster, you can play a 2nd level Monster of any type. While credit may not be earned more than twice in a month, players wishing to portray a Monster may do so, so long as they get approval from a Reeve. Monsters are listed in much the same ways as normal classes, though they tend to have a much larger list of special Traits and Abilities. When playing a Monster you must always carry a complete description of the Monster on you, have a copy for the Reeve and wear appropriate garb. If you are summoning Monsters, note that both the garb and the descriptions are part of the magic component. There are three ways you can play a Monster in a game, detailed below.
 Additional monster resources
|Amtgard Character Classes|
| Core Classes: Anti-Paladin · Archer · Assassin · Barbarian · Bard · Druid · Healer · Monk · Paladin · Scout · Warrior · Wizard|
Non-Standard Classes: Monster · Peasant Alternate Classes: Bushi · Duelist · Gypsy · Pirate · Spell Thief · Thief