Upon use you choose a single spell you can cast. When you cast the chosen spell you receive a +1 bonus to your spell attack bonus and spell save DC. You can only receive this bonus once and you regain its use when you finish a short rest. You also receive a -1 penalty to your wisdom saves. All effects of Farsight end after you finish a long rest or you take a dose of Insight. The effects and duration stack up to 3 times.