Brushfire (Insane) is the third and final stage in Island of Ash.
- Lord Gravey appears after 10 seconds
- Squire Rel spawn infinitely after 10 seconds, stack every 10~16.7 seconds300~500f
- Zoge spawn infinitely after 20 seconds, stack every 20~40 seconds
- Gory spawn infinitely after 20 seconds, stack every 26.7~40 seconds800~1200f
- up to 4 Gory Black can be seen after 40 seconds, same respawn time as Gory
- up to 3 Zomboe can be seen after 46.7 seconds1499f, stack every 40~46.7 seconds1200~1400f
- Shadow Boxer K spawn infinitely after 60 seconds, stack every 40~60seconds
- up to 2 Zang Roo can be seen after 73.3 seconds2200f, stack every 33.3 seconds1000f
- Dark Otter spawn infinitely after 80 seconds, stack every 13.3~20 seconds400~600f
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