Stormlord's Rest

From publisher blurb:

Mini-Dungeon for 4–5 characters of level 2

Plenty are the colorful and grandiose epithets used by warlords and powerful leaders, though the man once known as “Stormlord” chose a more apt one than most: obsessed with lightning and engineering, ostensibly blessed by the storm winds, the realms breathed a collective sigh of relief when he finally fell in battle. His humble final resting place, though, has continued to baffle would-be tomb robbers.

Can the party succeed where others have failed, or will their lightning-charred bodies join the ancient warlord in the Stormlord’s Rest?