The Possessed Flamesaw is a weapon similar to the Possessed Hatchet, and is obtainable in the Exxo Avalon source mod. It has a base damage of 95, and is capable of instantly chopping trees down.
Crafting:
1 Possessed Hatchet, 1 Adamantite Chainsaw, 30 Souls of Blight, 50 Cursed Flames, 160 Living Fire Blocks.