What does Spellfire Robes reward?

Spellfire Robes gives Lesser Spellfire Robes outright, 1,050 experience.

What level is Spellfire Robes?

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 Undercity and turned in to Victor Ward. Recorded by 1 player running the addon.

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

Item	Given	Item level	Vendor sell
Lesser Spellfire Robes	outright	20	5s 56c

What does Spellfire Robes reward?: Spellfire Robes gives Lesser Spellfire Robes outright, 1,050 experience.
Where does Spellfire Robes start?: It was picked up in Undercity.
What level is Spellfire Robes?: Its level has not been recorded yet; it shows once a player accepts it with the addon running.
Is Spellfire Robes 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 · Undercity