Chitin scraps can be used to repair the tier-90 drygore weapons. They are created by using damaged chitin on an anvil, and the amount of scraps received from each chitin scales with your Smithing level, up to 40 at level 99. If you are not 98 or 99 Smithing, you can use this table to see your expected profit per hour, again assuming 230 kills per hour: {