From publisher blurb:
A Mighty Fortress!
Ultimate Strongholds brings you an awesome array of fantastic fortifications for your 5th Edition Campaign! This exhaustive encyclopedia integrates all levels of 5E play, from classic party-level adventuring to an easy system for creating buildings of your own, on up to the expansive kingdom-building and management rules in Kingdoms from Legendary Games! Explore tons of new options for buildings, rooms, augmentations, and fortified buildings, as well as unusual building locations. Dive into siege warfare with an array of siege weapons, ammunition, and special structures and building materials. Ultimate Strongholds goes far beyond the basic building blocks, of course, with a wealth of information for buildings integrated with kingdom and settlement attributes and a host of exotic strongholds and structures, from cloud castles to water walls, flesh piles to crystal palaces, hedge forts to ghostly redoubts, with rules for damaging such bizarre and magical constructions and the hazards they bring! Plus, you get over two dozen new spells ideal for defending your stronghold or breaching the holds of your enemies like battering bolt, deathless defenders, and spiritual pike wall, along with spells to enhance the fortress itself like elemental architecture and haunted ruin! Last but not least, you also get the brand-new castellan arcane tradition that guides and guards a fortress like no one else can!