A knife is a tool used for a large variety of tasks, mostly for fletching logs in the Fletching skill. This is also an excellent tool for cutting through webs, especially to the Mage Arena in the deep wilderness. A knife respawns in Lumbridge castle kitchen cellar, and one respawns in Seers' Village. There was a notorious glitch involving knives in RuneScape Classic.
You can find a knife in the basement of the Lumbridge Castle on a table
- Shaping logs in the Fletching skill.
- Slashing webs.
- Slicing and dicing oranges, limes, bananas, lemons and pineapples in the Cooking skill.
- Cutting cacti in the Kharidian Desert to fill waterskins.
- Cutting chocolate bars into chocolate dust.
- Chopping up things into bowls such as tuna, Sweetcorn, and tomatoes