Church of Tyr

Tyr is the god of rains and of storms. He is the consort of Haoma, goddess of harvest. is depicted as an electric horse galloping out of the sea with lighting emerging from his hoofprints who races across the sky and dives to earth, even under the sea, to do battle against the evil witch Duzhyairya (symbolizing bad harvest), and the demon Apaosha (drought). He is often represented as rising from the Vourukasha Sea, the source of all waters, rising into the air to find and do battle with his enemies. His strength is dependent on the proper worship given by the people. He demands obedience and if people do not perform the correct rites with the appropriate spirit, it is said that his power will weaken the forces of darkness would prevail, and drought and bad harvest would follow. While he s often worshipped in small acts of faith to help bring good harvest, but he and his wrath are feared by civilized folks and the storms he brings known to bring devastation. Secret sacrifices are said to be made to appease him, though his worship has been banned in Wintersport and Parsa before that.

Evil aligned Greater Deity of storms and destruction His dogma was self-serving, demanding utter obedience from his priests and instructing them to spread destruction where they might.
Worship of Tyr was outlawed in many countries. Most Tyrian holy sites were secret because of the church's reputation. Public churches often took the form of castles or fortified strongholds that lay on earthquake fault lines or in the path of storms or lava; Talos ensured they remain unscathed.
Clerics of Tyr celebrated Tyrian festivals with ceremonies that summoned lightning and storms.
Calling Down the Thunder – This ritual involved the sacrifice of an intelligent being by lightning.
The Fury – This was the ceremony in which the cleric prayed, made berserk attacks to wreak as much destruction as possible in a small amount of time, then prayed again.
Blood Anchorites Based on the Anchorite Moesko described on pages 41 and 42 of the manual.
Highly trusted and influential Anchorites of Tyr are granted additional powers by the evil god. Such boons are granted only to those who demonstrate a lifetime of devotion to destruction in the name of Tyr
Blood Anchorites have a pseudo immortality similar to lichdom.
In a ritual involving lightning sacrifices, A potential blood anchorite’s heart is removed and placed on the altar. If Talos accepts the candidate lightning strikes the heart filling it with life despite being detached from a body. Additionally the heart is filled with an evil power to accomplish the work of Tyr.
The heart works similar to a phylactery. If [a blood anchorite] is killed but his heart has not yet been destroyed, his body reforms in 24 hours, regaining all its hit points and becoming active again. The new body appears within 5 feet of the heart. -- Dragon of Icespire Peak p. 42
Blood Anchorites are rare and powerful. They serve as the leaders of Tyr worshipping cults and set up temples to their unholy deity.