Bandolier of Silver Bells

This bandolier contains 7 bells in various sizes. It serves as a spellcasting focus. The potency of the effects depend on which number of Bell you use. 

Bonus to spell attacks and DCs: 1 plus the number of the bell you use, for example, using bell 7 (the biggest) would be 1+7 for a bonus of 8.

However, using such a powerful item has its penalties. Each time you use a bell, you must make a wisdom save with the DC being 16 plus the number on the bell, or you also fall under the effects of your own spell. For example, if you use bell 1 (the smallest), you would need to succeed on a DC 17 Wisdom saving throw. 

Wisdom can be swapped out for a different save, depending on the spell you cast using the bells, but it is the default. 

Notes: Caster