"None that kill?" the novice asked. "Why not slay our enemies outright?"

"Because for all drow, there is a chance of redemption," Cavatina answered. Then she smiled grimly. "Though for some, the chance is much slimmer than for others. That's what our swords are for. Once an intruder is debilitated, we give her one chance. She can live by the song-or die by the sword."

Thaleste nodded, her eyes bright with tears. She'd made that very choice, just two years ago.

They moved on, softly singing the hymn that disabled the cavern's other magical protections. Tiny bells, hanging from silver threads, had been secreted here and there among the columns. Capable of detecting anything that moved in the cavern without singing the proper wards, the bells were ensorcelled to sound a clamorous alarm that could be heard dozens of paces away. A silence spell could muffle the sound, but the spell would have to be cast several times over-once per bell-and each bell's hiding place would have to be found first.

All of the bells Cavatina randomly selected to inspect were in place; none had been disturbed. Each rang with a clear ping when Cavatina flicked it with a fingernail.

Just like the Promenade itself, the caverns were protected not only by visible defenses but also by less tangible magic. Forbiddance spells had been put in place with sprinkles of holy water and wafts of incense, invisible to any who did not have the magic to detect them. They were a potent barrier, one that prevented enemies from teleporting or shifting there-even in astral or ethereal form. The forbiddance spells were permanent, and only the most powerful of spellcasters could remove them. The only way to bypass them was with one of Eilistraee's holy songs, and even that held no guarantee of safety. Those who used the song to slip past the magical barrier would, if of evil intent, arrive with grievous wounds-possibly even fatal ones.