Regarding the final battle in "New Splendid World," if I remember correctly, the tactic there boiled down to the following: it was necessary to defend behind a power field with the azure dragon and snipers so that the enemy fairies would spend all their spells on the snipers, whom we regularly resurrect; that is, the fairies should not have access to 4th-level magic, otherwise the azure dragon would die. After the fairies had exhausted their spells, we raise a stack of snipers (fortunately, there is enough mana) and under Frenzy, we shoot everyone down.
Regarding the final battle in "New Splendid World," if I remember correctly, the tactic there boiled down to the following: it was necessary to defend behind a power field with the azure dragon and snipers so that the enemy fairies would spend all their spells on the snipers, whom we regularly resurrect; that is, the fairies should not have access to 4th-level magic, otherwise the azure dragon would die. After the fairies had exhausted their spells, we raise a stack of snipers (fortunately, there is enough mana) and under Frenzy, we shoot everyone down.