The value that it demonstrated goes without saying, it was as if Gaven now had a Hobgoblin Army with him at all times, ready to summon on site without the burden of logistics and supplies.
What's most important, it provided an entirely new tactical approach.
Gaven could totally infiltrate enemy core areas secretly and initiate a summoning, causing internal chaos—a standard strategy of teleportation warfare that they could now employ in advance.
Moreover, his territory was originally scattered, and even using Teleportation Spells, frequently maneuvering troops was a troublesome matter.
With this flag, a lot of trouble would be saved.
Even the method of summoning was clearly arranged.
He could summon a small number of Transcendent Battle Groups, and when Gaven went all out in an attack, piling his Charisma over thirty, he could easily summon up to a hundred Hobgoblin Giants at once.