for the leon bow check this site:
For the knife check this site:
You will need a lot of Keen talic since you can get the leons blue print and leon box when you exchange it in talic exchanger.Also, talic exchanger does not always give leon blue print or leons box sometimes it give recover exp capsule. it gives random leon box as you open the leon box you will receive a random leon parts which you need to have 4 parts of any kind of weapon you need..When you have a set of 4 parts of any kind like 4 part of bow and 4 parts of knife you will go to hero and combine the 4 parts of bow or 4 parts of knife + the LEONs Blue print..When you combine it.. it does not give a 100% combining. some times some of the leon parts are destroy or the leon blue print...If you successfully upgrade the leon knife or bow you will receive a random ability of leons knife and bow.. It has 3 kinds it High, Medium, and low...