Athos nods to the new comer. "My name is Athos Blackwind. Pleasure to meet you my lady."
This little party was getting quite large. Hopefully it meant easier going when it came to the fighting.
---Everyone---
(DM - Everyone roll perception again.)
---Athos, Arius, Kriv, and Nightingale ---
All of them notice for the first time that this first crumbling floor has veritable dozens of openings into the wall. Most presumably leading into caverns that swallowed the majority of the fortress. Along the floor are also hundreds of dusty little paw prints that look relatively fresh.
Just at that moment Giant rats leap from the openings to swarm into the area. The large man Mourn is immediately swarmed over and pulled down the stairs with loud scream mixed with squeaky clangs. The two girls next to him, The half elf girl that just arrived with the knight and the tiefling bard Leloth, who traveled with them from Waterdeep, were also swarmed and knocked down the stairs.
Everyone else having noticed the signs managed to dodge the immediate sneak attacks, but the others were not so lucky.
---Mivia---
(DM - Roll a Reflex save to avoid two of them jumping at you you didn't notice the warning signs with the last Perception check. Though You have a +2 bonus from seeing how everyone else reacted, and +1 bonus from the perception check before that. So a +3 bonus all together.)