Bebilith venom

From NWNWiki

Initial effect: Lowers Constitution by 1 to 6 (1d6)
Secondary effect: Lowers Constitution by 2 to 12 (2d6)
Save DC: 20
Handle DC: 16

Bebilith venom is resisted upon contraction if the target makes a successful fortitude saving throw. If the save fails, the initial effect is applied, and one minute later a second saving throw is attempted to avoid the secondary effect.