Quick Answer
Guildrun Protection Crystal is a defensive event item whose current confirmed change is a reduction from three charges to two in Demo 0.5.5. The developer explained that Protection Crystal and Force Crystal were effective at helping players through difficult fights, but three charges solved too many problems. Use each charge for a fight where the defensive effect changes the outcome, not merely because it is available.
The official public note does not publish the complete current tooltip, charge trigger, or exact protection amount. Those details are To be confirmed unless read from the current in-game item description.
The Two-Charge Update
The only exact current value established by the official patch note is two charges, down from three. This is a balance change, not a claim that the item has two total uses in every possible state; the precise charge behavior belongs to the live tooltip. Keep the article version-scoped so a later update does not make the number look timeless.
The change also gives a practical lesson: each charge is more valuable because the supply is smaller. Spending it on a fight that the board already wins can leave the run without an answer for a boss or high-difficulty encounter.
When to Spend a Charge
Spend Protection Crystal when the next fight has a known defensive check and the charge addresses that check directly. A low-health tank, a dangerous opening exchange, or a boss whose damage otherwise ends the run are examples of situations to test. The exact encounters and thresholds are not fully documented in the official sources, so keep any fixed list To be confirmed.
Do not delay every charge forever. If using one charge prevents a run-ending loss and the later fight can be solved with normal resources, that is usually a better decision than hoarding it. This is editorial guidance based on limited charges, not an official rule.
Protection Crystal and Force Crystal
The official patch groups Protection Crystal and Force Crystal together because both had three charges reduced to two. They are related pages, but not interchangeable pages. The exact difference between their effects is To be confirmed from the current game interface, so this page should not invent a comparison table.
Use the Force Crystal guide for the parallel item and the Guildrun relics guide for event-choice context. Linking the two pages helps players compare the names without suggesting that one is always better.
Team Context
Protection Crystal is most valuable when the team has already invested in a coherent plan and only needs a temporary defensive bridge. A tank such as Skorn can make a protection charge last long enough for Shields or Stall to matter, while a fragile carry may need a different kind of support. Exact interactions with every hero are To be confirmed.
If the team is fundamentally missing frontline strength, one item cannot repair the whole configuration. Use the best tank guide and current build page to fix the underlying board before spending a limited event item.
Mode Decisions
In normal progression, save one charge for a fight that teaches the run's next defensive requirement. In Red Rift, early survival can justify spending sooner because a single loss may end the run. In Endless, the value depends on how long the current effect remains relevant and whether later floors create a more urgent defensive check.
The official patch does not publish a mode-specific tier ranking. Treat “best floor to use it” and “best holder” as To be confirmed until supported by current gameplay evidence.
Current Verdict
Guildrun Protection Crystal currently has two confirmed charges under Demo 0.5.5, reduced from three because the developer felt the old supply solved too many problems. Treat it as a limited defensive answer, spend it on a real failure point, and verify the complete tooltip before adding exact effect details.