Dirtskin

Dirtskin is one of the 3 biome bosses you must fight before Holder of Souls. He is the easiest, and has a 15% chance to spawn each day, or use a Worm Food in the Purity during hardmode. He only has one phase (two in expert)

Phase 1
When summoned, the worm food will burrow into the ground and out will come Dirtskin. He will throw dirt at you, like Antlions spitting sand. Every minute, he will use a big Onyx Blaster to try to shoot you.

Phase 2 (expert)
When at 10,000 HP, Dirtskin will shed, revealing his real form. He will fire dirt more rapidly, and spit sucklers (brown worms with 100 HP and 6 defense). The Onyx Blaster deals more damage. All attacks have a 33% chance to inflict Weak.

Drops
ONLY ONE OF THE FOLLOWING WILL DROP: THE FOLLOWING DROPS ARE NORMAL MODE ONLY: THE FOLLOWING DROPS ARE EXPERT MODE ONLY:
 * Trophy (10%)
 * Mask (14.5%)
 * Random Elmbem (50%)
 * Sniper Rifle (33%)
 * 10-27 Dirt (33%)
 * The Pure Blade (Same Stats as Terra Blade) (33%)
 * 40 Silver Coins
 * 35 Gold Coins
 * Dirtskin Treasure Bag

Aftermath

 * All monster defense in the Purity is raised by 2.
 * The Dryad will now sell Chlorophyll Ore for 5 Gold Coins
 * Player attack is raised by 10% while in the Purity.
 * Snow Killa can now spawn in the Snow Biome (naturally or manually)

Updates

 * 1.4: Dirtskin added.
 * 1.4.4: Now inflicts Weak on expert. Suckler attack added.
 * 1.4.6: Now drops a random emlbem. Melee attack took out.
 * 1.4.8: Onyx Blaster attack added. Fixed glitch where treasure bag would drop on normal mode.