Monster Train mechanics

Original Monster Train rules: Doublestack changes status application, Endless returns a card to the draw pile, and Pact Shards trade immediate power for stronger enemies.

Term	Original-game rule	Practical use	Evidence
Doublestack	Doubles the number of status stacks applied by a spell; Stackstone also adds 1 Ember cost.	A spell applying 3 stacks applies 6, rather than doubling its ordinary direct damage.	2 sources · Japanese glossary/shop and merchant guide
Endless	When the unit dies, its card goes to the top of the draw pile.	Useful for repeated Summon triggers; reserve the next draw for the returning unit.	2 independent sources · SuperCheats and Pro Game Guides
Holdover	A played spell is placed at the top of the next turn’s draw pile.	Repeat a key spell, while accounting for the draw slot it occupies.	1 source · Japanese glossary
Pact Shards	Optional rewards increase enemy strength; 100 or more after Seraph opens The Last Divinity.	Choose rewards against the extra enemy difficulty, not just the immediate upgrade.	2 sources · official DLC and Fandom
Hand limit	10 cards.	Frozen and recurring cards can reduce room for fresh draws.	1 source · Japanese Tips
Tomb	A Melting Remnant unit subtype, commonly associated with Extinguish effects.	Arrange its death for the trigger; it is not an extra clan.	1 source · Fandom units reference

Endless returns the card, not a promise to preserve every temporary battle buff. Permanent card upgrades and permanent gains should be distinguished from status stacks on the unit. If a particular combo depends on retaining a specific status, use that card’s exact interaction text; the generic keyword alone does not establish retention.

Pact Shards belong to The Last Divinity. The official DLC page specifies that reaching 100 or more when defeating Seraph adds the final battle. Divine artifacts are a separate set of temporary rewards documented by the original-game wiki. Both systems should be kept separate from Monster Train 2 keywords.

A concise deck makes these rules easier to exploit: repeated draws of a useful spell can matter more than another expensive payoff, but too many Holdover or Endless returns can crowd out the rest of the hand. Compare the original card notes and clan roster when choosing the support package.

FAQ

Does Doublestack double spell damage?

It doubles applied status stacks. Ordinary direct damage is a different effect; Stackstone’s upgrade also adds 1 Ember cost.

How many Pact Shards open The Last Divinity?

The official DLC page says 100 or more when you defeat Seraph.

Does Endless keep every buff?

It returns the card to the top of the draw pile. Do not infer retention of every temporary unit status from that keyword alone.

Sources

Japanese wiki — glossary — checked 2026-11-09
Japanese wiki — shops and upgrades — checked 2026-11-09
SuperCheats — merchants — checked 2026-11-09
SuperCheats — keywords — checked 2026-11-09
Pro Game Guides — original combos — checked 2026-11-09
Official — Last Divinity rules — checked 2026-11-09
Fandom — Pact Shards — checked 2026-11-09
Fandom — units — checked 2026-11-09
Japanese wiki — Tips — checked 2026-11-09