Bone Book Lv 3 + Bard (or any units that needs walking, like Kobolt, cause Lv. 3 change from normal skeleton to Summoner)
Armor + Succubus (or any high dmg unit works)
Blessing Book Lv. 3 — Also gives 2x DMG on next hit.
Spells on Flying Skull carries over to its summons.
(Flying Skull + Funny Bones)
Both +1 Hp/ATK per turn are Super Strong