May She Rest in Peace

Prerequisites
To begin this quest, you will need to be rank of Curate, and have completed the Bloodstone Pilgrimage. Completing the preceding Temple quests in Almas Thirr, starting with Lloris Dalen in the Canalworks Temple, will get you to the required rank.

Quick Walkthrough
#Speak to   at the Monastery of St Veloth.
#Travel to   and speak to  .
#Return to   and speak to   in the Waistworks.
#Speak to Dala at  , south of Dondril.
#Either convince hetman   to permit burial, OR speak to   in  .
#*If the hetman is convinced, convince Garo to allow a cleansing ritual, then give the ashes to the hetman.
#Return to Garvs, then Vaden Baro (or just Vaden Baro if Garvs is arrested).

Detailed Walkthrough
Speak to Vaden Baro at the Monastery of St Veloth on the east side of Almas Thirr. He will offer you a place among the Speakers of the Dead, assuming you agree to complete two sacred tasks first.
For the first task, Vaden asks you to seek out Garvs Ovav, who is mourning over the death of his daughter, Fedura. Before setting out, it may be useful to set a mark in the monastery, for easy return later. You can find Garvs Ovav, wandering the streets of Dondril. He will ask for someone from the Temple who can perform cremations. Seek out Dala Aralen in the Waistworks of Almas Thirr. She is standing between the two trioliths in the southern part of the waistworks. Once she has agreed to help, meet her at Garvs’s shack, south of Dondril. Speak to Dala to receive the ashes of the deceased. She will note an odd energy, as if Daedra were watching.
Present the ashes to Garvs. He will ask you to take them either to the city of Necrom or convince the hetman of Dondril to bury Fedura here.

Convincing the hetman
The hetman, Nalis Varo, is in the only non-wooden hut in Dondril. He will need 70+ disposition towards you before allowing Fedura to be buried nearby. On 90+, he will also welcome Garvs back into the village. He is susceptible to bribes however – 10 gold provides a considerable disposition increase alone. The hetman does have one requirement before burial however – Fedura’s remains must be subjected to a cleansing ritual.
Return to the shack and speak to Dala. She will warn you that refusing this cleansing ritual is a serious crime, and that Garvs must accept when asked or be taken in for questioning. Garvs himself will need a disposition of 90+ before he accepts. You will get three chances to ask him about Fedura before he refuses to speak about it further.
If Garvs accepts the cleansing ritual, speak to Dala to have it performed, and then return the ashes to the hetman, who will have Fedura buried. You may then return to Garvs for your reward, and Vaden Baro for the second sacred task.
If Garvs cannot be convinced, speak to Dala. She will instruct you to take the ashes to Necrom while the inquisitors come for Garvs.
Reward (if Garvs is not arrested): Counterspell Ring

Traveling to Necrom
Necrom is a Dunmer holy city for the dead, on the eastern coast of Morrowind. You may wish to mark Garvs’ shack before setting out, as it’s a very long way away. On arrival, seek out Bradys Hlaalo in the Chamber of Parting, a round tower in the northwest of the city. He will accept the ashes without question.
If Garvs has not been arrested, return to him and speak about the ‘sacred task’ to collect your reward. Then return to Vaden Baro to complete the quest. If Garvs has been arrested, return straight to Vaden Baro.

Quest Stages