The merger of broadmouth is indispensable for faction crypts. But with the buff he's had, he's really excellent in early, and I'd almost recommend him in 80% of drakes 16, so you can farm the drake 16 without farming the drake 13.
To merge Largegueule, go to Merge in the summoning portal.
All the uncommon ones can be found in the countryside, so all you have to do is farm.
For the missing 2 rare Voids, you must either summon them, or spend 10 days buying them in the Souk (3vs3 arena). This must be done quickly. You can only buy them once, however, and once every 24 hours.
So I advise you to set up a troll def (3 champions level 1 in arena def 3vs3) and type every day. And get your 10 fragments.
Once you can summon it, you can wait for a tournament to open it, which will give you points or a CVC. Prepare food to mount it quickly 6*. It's useful in early unless you have a better champion such as Gorgorab.
