Board Thread:Questions and Answers/@comment-50.135.158.2-20170106014715/@comment-26447088-20170106032818

Sippar (for HP) and Aigai (for ATK) were common fillers. For defense, Ullikummi became more popular due to her cost dropping to 8 upon ascension.

The only time I use 5 or 6*s in defense is Fortress Frenzy, but I just end up filling it in with my collector's units that have decent stats/skills.