An expedition — a multi-part escalation chain (typically four sites) obtained by chance (~5%) from an unrated complex, tracked in The Agency. Each completed part has roughly a 50% chance to continue, usually toward lower-security space than where it began.
The Serpentis Secrets spawns in high-sec, low-sec and null-sec. How you find it: escalation only — cannot be scanned down.
What spawns in the Serpentis Secrets?
The Serpentis Secrets has 12 waves and about 232 NPCs: 96 battleships, 22 battlecruisers, 30 cruisers, 12 destroyers, 46 frigates and 17 sentry towers. Killing the trigger ship spawns the next wave; the triggers are Shadow Serpentis Lord Admiral and Serpentis Defense Sentinel.
Does the Serpentis Secrets escalate?
The Serpentis Secrets is itself an escalation from Serpentis Provincial HQ.
What does the Serpentis Secrets drop?
Faction/commander drops scale with the chain's depth; the fourth site carries the headline table.
Access C Single-source / unverified
Ship restrictions
Unknown
NPC roster C Single-source / unverified
Community-maintained wave list from the site's own wiki page — counts and triggers vary between spawns; treat as the shape, not gospel.
Serpentis Corporation