Sometimes experiments go horribly wrong, and this adventure concerns one such, as the party are summoned to the Pathfinder Society Lodge in Sothis, capital city of Osirion, to deal with the aftermath of one such that has left a horribly vile creature trapped under the very Lodge itself.

The introduction explains what really happened (and who was responsible), naturally as the adventure itself opens the briefing the characters get is somewhat less informative. All they are told is that they are going to have to play exterminator in the vaults under the Lodge - oh, and the only person who knew what was going on down there has since fallen prey to dementia, the creature having been trapped there decades ago. Apparently his assistant found something in his papers about it and went down there on his own to take a look, and of course has not come back.

Armed with this limited information, the party will have to explore the vaults and deal with whatever they find there. A clear floorplan is provided along with quite detailed notes of what's there to be found... and what will attack! The party should be kept quite busy. It does appear that untoward experiments were taking place down there, and captives held... not quite the sort of reputation that the Pathfinder Society would like to have... and in the best possible fashion, there's a Big Bad to be found at the very end of the vault, just itching for that climactic level-end 'boss-fight'.

It's a good straightforward delve with plenty of opposition to fight. The Faction missions seem implausible in the main, if it's such a dark secret what's down there (even according to the DM's background notes), how have the Faction leaders got the information to make the requests that they have made? The tasks themselves are fairly easy to accomplish, it's just the making of them that wrecks the realism of the situation. Parties who enjoy a good fight will be in for a treat, but that's it. More could have been made of the situation, how it came about and how it might be resolved.

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Reviewed: 7 February 2016