It's time to prove you're the dungeon master! In Stonespine Architects: Invasion, an expansion for the acclaimed card-drafting game, Master Hortgully challenges you to defend your creation and train a sinister boss monster. Forget just building; now it's time to kick some butt and show who's boss! You'll face invading heroes, level up your monster, and solidify your status as a true Master Architect. This game, accommodating 1 to 5 players, puts you in the race to construct the most perilous labyrinth of all. At the end of each round, it's time to deploy your boss monster and its minions to protect your ever-expanding dungeon from heroes who dare to invade. The player who manages to defeat the most heroes without letting any escape earns a hefty bonus, but don't worry: all players accumulate experience for their monsters, unlocking unique abilities and new scoring opportunities. Between rounds, you can spend your hard-earned gold to customize your labyrinth with additional monsters, treacherous traps, gleaming treasures, and secret passages that will confuse any adventurer. After four years of pure ingenuity and strategy, whoever has the deadliest dungeon will be crowned the Master Architect!