Sentinel firing cores (evergreen reference)

Sentinel firing cores (wording may vary slightly in-game) are the kind of rare ARC part past expeditions sometimes asked for. Expedition 3 data on this site does not include them today — check your expedition UI before you commit nights of farming.

Research note

We do not host verified weak-point diagrams or drop weights for Sentinel-family ARC here. Use patch notes, in-game inspect text, and community kill logs you trust — then update your own notes.

Suggested approach when it is on your checklist

1. Pick one map and learn third-party timings (see best maps).
2. Run short, repeatable clears instead of chasing every distant fight.
3. Pair with squad callouts for posture and rider adds — same discipline as Bombardier Cells.