Editorial strategy analysis for the base game: Lost Ruins of Arnak lasts five rounds. A resource is valuable when you can turn it into research, a site, a Guardian, a useful card or points before that clock runs out. Start each turn by asking what the next action unlocks, rather than choosing a system in isolation.
Plan the next conversion, not only this action
Exploration, research and deck improvement use overlapping currencies. Before spending travel to discover a site, check whether the expected reward enables a specific next step. If you need a research cost and an available site could supply it, the exploration may connect two actions; if you cannot afford the site or exploit its reward, a simpler resource action may be better.
Illustrative choice: You could spend the current turn acquiring a card that might improve future travel, or pay a research cost now to claim a one-time bonus tile before a rival reaches it. Compare how many rounds remain for the card to be drawn and used with the certainty and timing of the research reward. The answer changes with your hand, opponents and track position.
Build a deck with the next round in mind
Cards can supply travel icons or their printed effect, so their useful side depends on where your archaeologists need to go. A late purchase has fewer opportunities to cycle through the deck. Prefer a card that solves a recurring shortage or creates a clear next-round action over adding a card simply because its printed effect looks strong. Read acquisition timing in the rulebook: Items and Artifacts do not enter play in exactly the same way.
Research: check both tokens and the race for bonuses
A research action moves one of your tokens along a connected track space after paying its cost. The notebook cannot move above the magnifying glass. Only the first player to reach a space with a face-up research bonus tile takes that tile, while the row effect is resolved whenever the space is reached under the rules. That creates a timing choice: an early magnifying-glass step may open a later notebook move and secure a contested bonus.
Do not assume every research advance is equally valuable. Compare its immediate effect, position for a later move and end-game points with the resources you must spend. The research reference covers token order and Lost Temple timing.
Explore with a Guardian budget
Discovering a new site produces rewards and reveals a Guardian. Look at whether your remaining cards and resources can pay the Guardian cost before the relevant end-of-round check. Sometimes the new site is worth the risk; sometimes a research step or card purchase makes a cleaner use of the same resource. Defeating a Guardian brings points and a boon, while leaving one unresolved can add Fear; see the Guardian and Fear guide for the timing.
Assistants and idols: account for opportunity cost
An Assistant that repeatedly converts a plentiful resource into a scarce one can replace weaker actions in later rounds. Upgrading it early offers more opportunities to use the improved ability, but only if the resulting conversion fits your plans. Do not upgrade automatically just because you can.
An idol may be kept for its printed end-game value or placed into an available player-board slot for an immediate effect. Using a slot changes the value you will score from that slot later. Ask whether the immediate effect pays for a concrete step that outweighs the final-point opportunity cost.
Round five: finish what can still score
As the last round arrives, count what your remaining turns can actually convert: a research advance, a reachable temple reward, a Guardian you can afford, or another printed scoring opportunity. A new card whose effect will not enter your hand before the end may contribute only its final printed value. Fear still in your deck can reduce the score. This is a change in timing, not a universal rule to stop buying.
Who these tips apply to
These suggestions use the standard base game’s five-round structure. Expedition Leaders adds asymmetric powers and other changes, while campaign modules can alter priorities. Use the exact card, leader and scenario text when an expansion changes a general heuristic.
Continue learning
Source and scope
Rule facts checked October 2026. The planning examples and recommendations are editorial reasoning, not claims of tested win rates.