Weapon (lance), uncommon (requires attunement)
While attuned to this magical lance, it does an additional 1d6 lightning damage on a hit. In addition, once per day, it can act as a javelin of lightning. When used in this way, the lance cannot deal additional lightning damage until the following day.
While attuned to the lance, the wielder gains the flaw “I must constantly push down my bloodlust.” There is a 1% chance each morning that the armanite demon bound within the lance escapes and attacks the characters or innocent people in the area. Once the demon escapes, the lance loses its abilities and becomes a normal weapon.
Discovered in Deftwood, ritual site, taken from Debier
https://www.dndbeyond.com/magic-items/4488766-armanite-lance-of-ahstriv