What does Proof of Demise reward?

Proof of Demise gives Zombie Skin Bracers, Clasped Belt, Netted Gloves outright.

Where does Proof of Demise start?

It was picked up in Tirisfal Glades.

Its level has not been recorded yet; it shows once a player accepts it with the addon running.

No. The quest exists in Classic Era as well.

World of Warcraft: Forever · quest

A quest in World of Warcraft: Forever in Tirisfal Glades. Recorded by 3 players running the addon.

Level, giver, pay and objectives show once a player with the addon accepts the quest.

Item	Given	Item level	Vendor sell
Zombie Skin Bracers	outright	8	19c
Clasped Belt	outright	8	23c
Netted Gloves	outright	8	16c

What does Proof of Demise reward?: Proof of Demise gives Zombie Skin Bracers, Clasped Belt, Netted Gloves outright.
Where does Proof of Demise start?: It was picked up in Tirisfal Glades.
What level is Proof of Demise?: Its level has not been recorded yet; it shows once a player accepts it with the addon running.
Is Proof of Demise new in WoW Forever?: No. The quest exists in Classic Era as well.

Source: what players running the addon saw in the quest windows; the quest text itself stays in the game. Every quest seen · Tirisfal Glades