For the handful of us trying to fight this.
Step 1. Kill the Snolls (white), don't let them explode.
Step 2. Get the Bombs (red) to low HP then leave them alone, they will automatically explode themselves.
Step 3. Repeat steps 1 and 2 until the boss shrinks to a size slightly larger that its minions.
Step 4. ???
Step 5. Profit!