Storm King's thunder.
(Book)

"For use with the fifth edition of Player's handbook, Monster manual, and Dungeon master's guide."--Back cover.

Ages ago, giants and dragons raged war across the Savage Frontier. Ancient relics remain, and now the land shudders with the thunder of giant footsteps. Puny adventurers must rise to the challenge, gather their strength, unlock the power of ancient runes, and take the fight to the giants' doorsteps. An essential reference for every Dungeons & Dragons roleplayer, this text contains rules for character creation and advancement, backgrounds and skills, exploration and combat, equipment, spells, and much more.