Brushfire (Insane) is the third and final stage in Island of Ash.
- 1 Lord Gravey spawns as the boss after 10 seconds300f.
- Infinite Squire Rels spawn after 10 seconds300f, delay 10~16.67 seconds300f~500f.
- Infinite Gories spawn after 30 seconds900f, delay 26.67~40 seconds800f~1,200f.
- 4 Gory Blacks spawn after 40 seconds1,200f, delay 26.67~40 seconds800f~1,200f.
- Infinite Shadow Boxer Ks spawn after 60 seconds1,800f, delay 40~60 seconds1,200f~1,800f.
- Infinite Dark Otters spawn after 80 seconds2,400f, delay 13.33~20 seconds400f~600f.
- Infinite Zoges spawn after 20 seconds600f, delay 20~40 seconds600f~1,200f.
- 3 Zomboes spawn after 46.67 seconds1,400f, delay 40~46.67 seconds1,200f~1,400f.
- 2 Zang Roos spawn after 73.33 seconds2,200f, delay 33.33 seconds1,000f.
Something that you can do would be to spawn Polevaulter Cat or any Long Distance unit, lure Lord Gravey towards 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. Weightlifter Cat works quite well as an anti-Black attacker.