From IvanWiki

Legifer, second hand to Valpurus.

If he's happy, he'll call upon Inlux and cause a big beefy explosion centered on your location. This explosion does not harm the player.

If he's unhappy, he'll cast of a beam of righteous fire at you. Like a landmine, this can detonate the player's carried wands and explosives, leading to a devastating chain reaction.

Aligned items: Scroll of Detect Material, Helmet of Piercing Perception, lanterns

Gifts: Praying to Legifer may earn you a Helmet of Piercing Perception, or a Scroll of Detect Material