You inflict a vow with yourself or a consenting party to gain something in return for giving something. What you gain must be equal or lower in value than what is offered up. The DM has final say on all vows. If they refuse, the spell slot is still used.
Self vows are the safest and easiest to create. Once created, you may break the vow at any time and simply lose the benefits. For example, If you enhanced your next sword strike in return for never swinging a sword afterwards, you could break this vow, and nothing would happen other than losing the effect which would already have been used.
Vows with others are much more dangerous and tough to use. Once they are made, if broken, there could be horrendous consequences (the consequences are up to the DM.)
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