Idavoll is the second expansion for the game Nidavellir. During the first three rounds of the first age, the second tavern offers mythical creatures, Norse gods, valkyries, and giants, adding an extra round to the game. Each new card type introduces effects never seen before in the game.

Gods:
When you gain a god's favor, place them in your command area and put one token on them. You can discard the token to use their ability.

Giants:
Once you acquire a giant card, place it in your command area and put 1 captive token under the corresponding column of your army. Each giant card requires capturing 1 dwarf card of a specific class.

Valkyries:
Once you acquire a valkyrie, place her in your command area and put a strength token on her card at the highest notch on the strength scale. Each time you fulfill the valkyrie's requirement, move her strength token down one notch on the scale. At the end of the game, each valkyrie grants you points based on the position of the strength token on her scale.

Mythical Creatures:
Once you acquire a mythical creature, place it in the corresponding column of your army. Each mythical creature has its own ability.

The rules and reference cards are in Czech and English. The game components are language-independent.