I'm a 14th level alchemist, and with my stats maxed, I only had a 30% chance to make this thing. I attempted 5, and only managed to make one.
2 essences of speed, which in themselves are not that easy to make. Each essence takes 2 thistle leaves and 2 hops, which are not in the easiest of locales.2 bags of mahogony sawdust2 pear juices1 ingot of adamantium