Acidic Twine

This spool of pure white twine seems completely ordinary to an untrained eye. A new spool contains 20 feet of twine.

When a one foot long piece of this twine is cut free, it begins to excrete a potent acid for 1 minute. The twine may also be cut into a five foot length which does not immediately excrete acid. Instead, it may be tied in place then activated by giving the other end a vigorous tug. Only the last one foot of the twine excretes acid. 

This acid will eat through flesh, wood, stone and even non-magical metals up to an inch thick within a round. Once the acid has been activated, the length of twine is consumed.