You have become a craftsman in your field. The artistry involved in your act of creation, from simple assembly to writing a sonnet or designing and sculpting a suit of chainmail is yours to command. Maybe you have spent your younger years learning to track a deer through rocky lowlands or studying history, biology or the arts.
Being a Master Craftsman gives you proficiency in your choice of Skill or Tool.
It also confers Expertise in your choice of Skill or Tool.
As an added bonus, you also get a +1 on the Ability Score of your choice.
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