Swamp/Green Boss Ogre Stickman

About
This boss can deal an alarmingly high amount of damage. It attacks by firing a single wave towards characters. This wave rebounds off terrain, and constantly emits poison cloud residue that expands outwards. The wave, if it hits directly, does a whopping 800 damage. The clouds, meanwhile, only deal 100 damage. Staying far away from this boss is the best option. It appears alone, giving you plenty of room to fight it without fear of retaliation from other enemies.