Overlord Card

The Overlord player uses Overlord cards to perform various abilities, such as benefiting monsters or springing a trap on the heroes. There are both basic Overlord cards, which the overlord player begins the game with, as well as upgrade cards, which he can purchase with experience points when playing the campaign.

There are three main classes of upgraded Overlord cards; Warlord, Saboteur, and Magus. Then, each expansion brought new cards:

Punisher was added with Lair of the Wyrm
The Basic II cards were added with Labyrinth of Ruin rather than a full new class
Infector was added with The Trollfens
Shadowmancer was added with Shadow of Nerekhall
Enchanter and Unkindness was added with Manor of Ravens

Within each class, there are three levels of cards available. Level 1 cards cost one experience point, level 2 cards cost two experience points, and level 3 cards cost three experience points. Level 1 cards are always available for the overlord player to purchase. In order to purchase a level 2 card, the overlord player must first currently have two Level 1 cards of that class in his deck. He must have three cards of a class in his deck (which can be any combination of Level 1 and Level 2 cards) before purchasing a level 3 card of that class. Unlike heroes, the overlord may purchase cards from multiple classes. Universal cards are always available for purchase.

In the base game, there are 4 universal cards each worth 1 experience point and each class has 4 level one cards, 2 level two cards, and 1 level three card in addition of the 3 basic classes.

Basic Cards

There are 15 basic Overlord Cards that the overlord player plays with in a non-campaign game. These are also the same cards the overlord player receives at the beginning of a campaign. These cards provide basic bonuses and traps.

Instead of the regular 15 basic cards, the Overlord player may choose 15 basic II cards introduced in the Labyrinth of Ruin expansion.

Universal Cards

There are 4 (2 more in Labyrinth of Ruin, 5 more in Shadow of Nerekhall) Universal Overlord Cards that the overlord player can spend experience points on after each quest. Each cost one experience. The abilities provided are general such as re-ordering the top cards of the deck, searching your deck, or healing a monster.

2x Plan Ahead
2x Dark Remedy (Labyrinth of Ruin)
Dark Resilience
Schemes
Placebo (Shadow of Nerekhall)
Solidarity (Shadow of Nerekhall)
Upgrade (Shadow of Nerekhall)
Refresh (Shadow of Nerekhall)
Diverse Means (Shadow of Nerekhall)

Rumor Reward/Quest Reward Cards

Some new Overlord cards are introduced in the Lair of the Wyrm expansion and may be gained without spending any experience points, but only when the Overlord player wins specific Rumors or Quests.

The Wyrm Queen's Favor (Armed to the Teeth rumor in the Lair of the Wyrm)
Splig's Revenge (Gathering Foretold quest in the Labyrinth of Ruin)
Twin Souls (Fire and Brimstone quest in the Labyrinth of Ruin)
Hidden Wings (Obtained through one of the Oath of the Outcast quests)
Fire Gems (Obtained through one of the Crown of Destiny quests)
Forgotten Sorcery (Obtained through one of the Crusade of the Forgotten quests)
Power in Numbers (Obtained through one of the Guardians of the Deephall quests)
Hard Knocks (Obtained through one of the Visions of Dawn quests)
Hunk of Junk (Obtained through one of the Bonds of the Wild quests)

Warlord

There are 7 Overlord Cards in the Warlord class. 4 level one, 2 level two, and 1 level three. The Warlord class focuses on creating more deadly monsters by giving them extra armor, more damage, multiple attacks, bonuses for defeating heroes, and allowing the overlord to spawn additional monsters. Each of the Warlord cards is an event type.

Magus

There are 7 Overlord Cards in the Magus class. 4 level one, 2 level two, and 1 level three. The Magus class provides cards that allow the overlord player to draw extra cards, use a dead monster, deal wounds directly to a hero, and force heroes to suffer additional fatigue. Each of the Magus cards is a magic type.

Saboteur

There are 7 Overlord Cards in the Saboteur class. 4 level one, 2 level two, and 1 level three. Each of the Saboteur cards is a trap that is triggered by something the hero does. The traps can add conditions, force rerolls, transform heroes into monkeys, and even force a hero to be defeated.

Punisher

There are 7 Overlord Cards in the Punisher class introduced in the Lair of the Wyrm expansion. 4 level one, 2 level two, and 1 level three. Punisher specializes in making heroes pay for every inch they advance. In addition, heroes may also be punished for attacking monsters or healing.

Infector

There are 7 Overlord Cards in the Infector class introduced in The Trollfens expansion. 4 level one, 2 level two and 1 level three. The Infector specializes in 'infecting' the heroes with special Overlord tokens to represent the infection. The infection tokens can be spent by the Overlord in various situations for bonuses.

Shadowmancer

There are 7 Overlord Cards in the Shadowmancer class introduced in the Shadow of Nerekhall expansion. 4 level one, 2 level two, and 1 level three. The Shadowmancer forces the heroes apart, potentially turning them against each other and forcing them to split up.

Enchanter

There are 6 Overlord Cards in the Enchanter class introduced in the Manor of Ravens expansion. 3 level one, 2 level two and 1 level three. The Enchanter specializes in boosting entire groups of monster with special lasting effects.

Unkindness

There are 6 Overlord Cards in the Unkindness class introduced in the Manor of Ravens expansion. 3 level one, 2 level two and 1 level three. The Unkindness specializes in a Raven Flock that is always active once bought. He can uses his cards to interact with that special flock, some kind of familiar, called servant, for the Overlord.