What does Speak with Deino reward?

No reward has been recorded for Speak with Deino yet.

Where does Speak with Deino start?

Anastasia Hartwell in Undercity offers it.

The quest log lists it at level 26.

No. The quest exists in Classic Era as well.

World of Warcraft: Forever · quest · level 26

A level 26 quest in World of Warcraft: Forever, offered by Anastasia Hartwell in Undercity. Recorded by 1 player running the addon.

Pay and objectives show once a player with the addon accepts the quest.

No reward item has been recorded for this quest. The offer window fills this in when a player with the addon opens it.

What does Speak with Deino reward?: No reward has been recorded for Speak with Deino yet.
Where does Speak with Deino start?: Anastasia Hartwell in Undercity offers it.
What level is Speak with Deino?: The quest log lists it at level 26.
Is Speak with Deino new in WoW Forever?: No. The quest exists in Classic Era as well.

What sells at this level, and what to keep from these rewards, is in the level 20 to 30 gold guide.

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