Exploring Ysgard rewards

Horn of Valhalla, Gold
You can use an action to blow this horn. In response, warrior spirits from the plane of Ysgard appear within 60 feet of you. These spirits use the berserker statistics from the Monster Manual. They return to Ysgard after 1 hour or when they drop to 0 hit points. Once you use the horn, it can't be used again until you spend a day of downtime fighting in Ysgard.
The gold horn summons 1d4 + 1 berserkers.
The berserkers are friendly to you and your companions and follow your commands.

Mark of the Valkyrie*
Requires attunement
You have proven yourself worthy to join the eternal war in Ysgard upon your death, You gain a +2 bonus to initiative as long as you are not incapacitated. A silvery mark appears somewhere on your face to prove this fact. When you loose attunement to this Item the mark vanishes.

*up to one per player