You can earn extra Zomm tokens by defeating Zomm via this quest. Kinda late, I realized that Zomm is showing up - sometimes! - in some of the regular campaign levels. The levels I have found so far are: chapter 3-5 stonehelm citadel; chapter 5-5 shogunate fortress; 6-6 necrotic chambers; 7-3 supply route; 9-3 the Black Forest; 12- (I forgot to write down the level number) the secret passage; 14-6 the vault. I haven't gotten to chapter 15 yet. Please add to the list if you find others!! You won't always get Zomm in the level, but you sometimes do.