Staff of Eyvind

Wondrous item, very rare, (requires attuntement by a spellcaster)

This wooden staff has been carved all over with patterns, which draw your eye. It has clearly been handled often, and the symbols are worn smooth as if traced by hand daily. The staff acts as a +1 quarterstaff, and acts as an arcane focus.

As an action you can trace the patterns on the staff, and expend a spell slot of your choice. Roll a number of d8s equal to the level of the spell slot expended.

On an even result, lightning crackles up the staff and flashes out of the top. The nearest creature to you receives lightning damage equal to the number you rolled. Creatures within 5 ft. of the original target take half of the original damage. If two or more targets are within range, choose the target wearing or carrying the most metal.

On an odd result, the whole staff trembles and bends with power. An ear-splitting boom eminates from the staff, dealing half the rolled damage to all creatures within 20 ft. All creatures within range must make a DC 10 + the spell slot level Strength saving throw or be knocked prone. The loud boom can be heard from up to 500ft. away, and cause a minor tremor if you are on solid ground.

If you have any levels in the Bard class, you understand the carvings of the staff as not just random markings, but mnemonics for lessons in history, spellcraft and magical theory.

You replace the odd result of the staff with the new option below. When you use the staff, you can choose between these two results no matter what you roll.

If you are standing on a natural surface, you can summon large stones from beneath the earth. You can summon up to as many troll stones as the level of the spell slot expended, and can summon them in any unoccupied space you can see. A troll stone occupies a 5ft square, can provide 3/4 cover, and all ground within 5ft of it is considered difficult terrain.

Finally, the spells Call Lightning, Thunder Clap, and Legend Lore are always prepared for you, and you have advantage on Arcana checks related to spells, so long as you hold the staff.