Testing week of May 23, Clue number 3

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Hello again everyone, here is clue number 3 for the week:

There is an Arena built to Keep It
And somewhere there is a clue, now reap it,
A small structure, which one you’ll plea?
A target sits on top you’ll see,
Shoot it and inside you drive,
Another clue to how we thrive,
More letters for the word we seek,
Of Eidolons’ energy and mystique.

Good Luck!