Brushfire (Insane) is the third and final stage in Island of Ash.
- Lord Gravey appears after 10 seconds300f.
- Squire Rel spawn infinitely after 10 seconds300f, stack every 10~16.67 seconds300~500f.
- Zoge spawn infinitely after 20 seconds600f, stack every 20~40 seconds600f~1,200f.
- Gory spawn infinitely after 20 seconds600f, stack every 26.67~40 seconds800f~1,200f.
- Up to 4 Gory Black can be seen after 40 seconds1,200f, same respawn time as Gory.
- Up to 3 Zomboe can be seen after 46.67 seconds1,400f, stack every 40~46.67 seconds1,200~1,400f.
- Shadow Boxer K spawn infinitely after 60 seconds1,800f, stack every 40~60 seconds1,200f~1,800f.
- Up to 2 Zang Roo can be seen after 73.33 seconds2,200f, stack every 33.33 seconds1,000f.
- Dark Otter spawn infinitely after 80 seconds2,400f, stack every 13.33~20 seconds400~600f.
Something that you can do would be to spawn Polevaulter Cat or any Long Distance unit, lure Lord Gravey toward the base and start spawning any stackable anti-Zombie/anti-Black that you have to keep the Gory Blacks and Shadow Boxer K at bay and so on until you can kill Lord Gravey.