Too Many Bones: Undertow

The stand-alone box supports one or two players with the characters supplied. Three or four players require additional compatible Gearlocs.

Select a Tyrant and use its days, Progress requirement, and enemy types. One Gearloc uses Solo Encounters; multiple Gearlocs use General Encounters, adding Undertow's opening and Tyrant cards as instructed.

Each day has New Day, Encounter, Reward, and Recovery phases. Failure skips rewards but still permits Recovery. With enough Progress, challenge the Tyrant instead of drawing an Encounter.

Spend Training on stats or eligible skills. Health, Dexterity, and skill training succeed automatically; Attack and Defense have their own training rolls.

Battle follows initiative. Resolve start-of-turn effects, move, declare a target, and choose available Attack, Defense, and skill dice, with remaining Dexterity limiting the roll.

Dexterity spent moving is unavailable for dice. Attacks require a valid target under the character's attack form; do not roll Attack dice without one merely to collect Bones.

Store Bones in Backup Plan, normally up to five. Pay the listed cost to use at most one Backup Plan skill per turn. Used skill dice normally exhaust until battle ends, subject to character-specific exceptions.

Water battles use the raft and Krelln rules. Entering a wrecked space costs party members one extra Dexterity; needing a fifth Wreckage chip ends the battle unsuccessfully.

If every Gearloc is knocked out, the battle fails and its Encounter grants no rewards, but the adventure does not automatically end. Recover normally; the lost day still matters.

In Recovery, trade Loot, attempt lockpicking, and choose one individual recovery option per Gearloc. Win the standard adventure by defeating its Tyrant within the allotted days; use separate setup for the three-Tyrant campaign.