This is the first boss of Bloodshade Harbor. You can stand in the middle without aggro'ing it.
When you're ready you can start dps'ing him. His attacks during the first phase are pretty lax and easy to dodge. They include a 360 degrees spin attack and some swipe attacks. He will cycle through these attacks 4 times and then jump onto the ceiling and enter phase 2.
When he enters phase 2, buy bns gold pick up the gun and start breaking the eggs. (Press 1 to break the eggs). Any eggs that remain after phase 2 is over will spawn in 100k hp mites. You will notice a cloud appearing after each egg you destroy. Standing in the cloud will block any projectiles he launches at you.
After all the eggs are destroyed shoot at him with your gun until he lands back on the ground, then drop your gun and start dps'ing him again. He will do his roar at this time so as mentioned earlier make sure you have cleansed your debuff by running under the waterfall. After this he will go back to phase 1 and repeat the same process.
At this point you will probably be poisoned and have what looks like green eggs forming on your character. If you see this run under one of the 4 waterfalls and it will remove it as well as giving you a movement speed and attack bonuses for 12 seconds . If you do not remove this debuff and he does his roar attack you will take significant damage and probably die so you need to Buy blade and soul gold to enhance their viability.