Masterful Focus

The forgotten masters of the blade swore to defend their secrets to the death, and were famed for their perfect clarity in battle.
You whisper a word and weave magic over your own mind, heightening your senses and reflexes. Until the spell ends, your attacks can result in critical hits more easily. Whenever the result of the d20 roll is 18-20, you critically hit. If you’ve made an attack with disadvantage and one of the results was in this range, you can ignore the disadvantage and critically hit regardless. Once you’ve critically hit, the spell ends at the end of the current turn.

At Higher Levels: When you cast this spell using a slot of 2nd level or higher, the range you can critically hit within expands by 1 (17-20, 16-20, and so on) per slot level above 1st.