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It's on page 118: "there is no limit to the number of detachments a battle-forged army can include". So, for each 1HQ and 2Troops you can include an additional 4 troops, 3 elites, 3 fast, and 3...

Exalted rewards "primaris" or #0 power is to choose a hellforged artifact (p.67). Portalglyph is on the list of hellforged artifacts (p.65). No luck involved.