On Holy Wings

This is the second stage of Mysterious Merc Storia chapter, which was added since the third Merc Storia collab.

Battleground

 * Orutosu appears after 16.7 seconds500f.
 * Seresu respawns infinitely here, after 33.3 seconds1000f, respawn after 10~20 seconds300~600f.
 * 1 Fuu appears at 50 seconds<1500f and 1 Orutosu at 60 seconds1800f marks.
 * 5 Seresu will stack slowly after 66.7 seconds2000f mark, stacked after 3.3~10 seconds100~300f.
 * When the enemy base is down to 99% health after 2 frames, it will spawn the boss and 3 Seramu that stack after 20 seconds600f.

Reference

 * http://battlecats-db.com/stage/s2048.html