This small tome is the gathered knowledge of the Five Kings of Stormkeep, ancient sorcerers, wizards and clerics who delved into the most diabolical of magic.  It is bound in embossed black leather, and filled with crisp pages of stark, white vellum.  Careful observers will notice a slight crackling coming from the book, and the occasional whiff of ozone.  Each successive King added his lore to that of his fathers, compiling rituals and enchantments thought lost to time.  

Within, the book details the entire process of creating an undead Stormskull, a watchful guardian crafted from the severed head of a Storm Giant.  It covers the preparation of the bones to graving the necessary runes and casting the awful enchantments to capture the elemental spirits within it.

Once attuned, the Book of Storms grants its user resistance to damage from Thunder, Lightning and Cold.  It also contains a number of spells, which can be prepared by the user with the proper spell slots and class requirements.  The spells within are also used by any Stormskull created by the book.  They are as follows:

1st level: witch bolt, shield, mage armor, thunderwave

2nd level: gust of wind, tasha's mind whip, warding wind

3rd level: lightning bolt, thunder step, dispel magic

4th level: ice storm, storm sphere, summon elemental

5th level: cone of cold, synaptic static

Notes: Resistance: Lightning, Resistance: Thunder, Resistance: Cold, by a Wizard., evocation, enchantment