The Glass Unicorn: Part 7 by Yasmine Galenorn

When Erenye Green, an editor at a small publisher, and several of her gaming friends find themselves stuck within the fantasy world of Abarria, they must learn to navigate the realities of what it really means to battle monsters, zombies, and all manner of creatures, now that the stakes are life and death, and no longer a simple roll of the dice.

Part 6: With the Necromancer after Erenye and her party, Otsiano guides them to the edge of the Cryptic Marshes, where they enter the dangerous land.

Notes:
This is a LitRPG serial.
Part 7 of the Glass Unicorn (A Quest Wars Adventure)