A conjuratory or exconjuratory (Aragonese: esconchurador, Catalan: comunidor, Spanish: conjuratorio) is a small religious building from which ceremonies were conducted to bless the fields and ward off calamities caused by the weather, like storms, hail and excessive rain that could ruin the harvests.
[1] Exconjuratories were usually built in a symmetrical way, with large windows open to the four cardinal points.
Located in each corner, special ceremonies were conducted in them by priests to ward off storms that could spoil the harvest in the fields by means of the Lignum Crucis kept in the cathedral.
[2] Conjuratories could also be used to ward off other non-weather-related catastrophical events afflicting the community, like epidemics and crop-damaging pests, like locusts.
[3] They fell into disuse centuries ago and many of the exconjuratories that have survived are in a ruined state.