The Serpentis Haven spawns in null-sec. How you find it: combat anomaly (on-board scanner, no probing).
What spawns in the Serpentis Haven?
The Serpentis Haven has 13 waves and about 98 NPCs: 43 battleships, 21 battlecruisers, 9 cruisers, 23 frigates and 2 sentry towers. Killing the trigger ship spawns the next wave; the triggers are Core (Grand/Lord/High) Admiral and Corelatis Sentry/ High Captain.
What should I tank and shoot in the Serpentis Haven?
Serpentis Corporation deal Thermal (55%) / Kinetic (45%) damage and are weakest to Kinetic / Thermal; they use Sensor Dampeners.
Does the Serpentis Haven escalate?
Completing the Serpentis Haven can escalate to Serpentis Fleet Shipyard.
What does the Serpentis Haven drop?
Bounty: about 40.000.000 ISK
Modules: Roughly 6.000.000-15.000.000 ISK
Salvage: about 15.000.000 ISK
Access C Single-source / unverified
Ship restrictions
Not recorded
Faction threat profile C Single-source / unverified
EWAR used
Sensor Dampeners
Faction-level profile, not site-specific. Tank their damage, shoot their weakness.
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 Fleet Shipyard — Chance to escalate to Serpentis Fleet Shipyard (DED 10/10) on FULL completion — community-estimated low single digits to ~8%, never published by CCP; see the Escalations & Expeditions page C Single-source / unverified