The demonic sigil is featured heavily in the Shadow of the Stormquest. The player using it must chant a combination of the words as shown in the Demonic tome to summon the demonAgrith-Naar. If a player does not take the sigils provided during the quest, more can be made by using a silver bar on a furnace with a Demonic sigil mould in their inventory. This item cannot be made after the quest is complete, even if the player still has the mould.
The demonic sigil is kept after completing the quest and with it, the emote can be used to chant the five words in any order you want. This has no effect and does not summon demons, even if the chant is in the correct order.