Adventure Set in Stone

You wake up to find yourself with the rest of your compatriots in a room in a rustic, old inn. As you awaken and walk down the stairs to the main lobby, the innkeeper greets you. On the table is a newspaper with the headline "Adventurers Wanted North of Town, Dungeon Clear".
Notes: Path to Dungeon forested with magic, Dungeon Traps include Stair Slide and Mimicry, Dungeon Inhabitants include Normal Enemies and a Sleeping Rock Golem, Rock Golem = Boss, Treasure is a Sword Stuck in Stone