Tower of Invarnak

This old, crumbled structure was once the home of a powerful wizard who helped to defend against the advance of the Dark King. Only the first floor and the three floors below ground are still somewhat intact.
In recent months, this became the primary location for an incursion of Slaad which threatened the lands north of Craven's Rest and Port Oruss. Tracks of the terrible creatures were found moving into and around the tower.
The ground floor had a small infestation of assassin vines. The first floor underground had a nest of carrion crawlers. There was also a set of tracks of two humanoid creatures, one medium sized and one small.
On the second level below ground, the party encountered another green slaad poking through the remains of ruined furniture and broken mosaic tiles. There was also a chapel, sealed by magic and protected by golem-like guardians. IN this place, the party also encountered the spirit of Invarnak himself.
He gave them information about the creature trapped below and sealed the chamber so they could rest up for what was a difficult battle. The party took down Groshrulok, rescued Voldo Korvoss, and collected the remnants of the wizard's belongings.