Nautilus Tomb

Nautilus Tomb (オウム貝の墓場) is the second stage in Ghost Sea.

Battleground

 * Lord Gravey appears with a boss shockwave after 6.7 seconds200f.
 * 2 Mr. Moles appear after 16.7 seconds500f.
 * After 20 seconds, Zroco starts to spawn every 23.3~30 seconds700~900f.
 * After 23.3 seconds700f, Znache starts to spawn every 26.7~33.3 seconds800~1000f.
 * After 40 seconds, Kang Roo starts to spawn every 53.3 seconds1600f, up to 4 can be seen.

Reference

 * https://battlecats-db.com/stage/s13012-02.html