Botanist (Expertise)

Your extensive study of nature rewards you with the following benefits:

• Increase your Intelligence score by 1, to a maximum of 20.
• You are proficient in Intelligence (Nature) checks. If you are already proficient in this skill you gain expertise, which means your proficiency bonus is doubled for any ability check you make with it. You are also proficient with the Herbalism Kit. 
• You learn the Detect Poison and Disease spell. You can cast detect poison and disease once without expending a spell slot, and you regain the ability to do so when you finish a long rest.a