In the character builder, it would appear that you can currently select any tool proficiency EXCEPT thieves' tools. When, in fact, you should only get proficiency with thieves' tools.
Does you character have thieves tool proficiency from another source—like maybe their class? With backgrounds, if you get that proficiency from something else, you are allowed to choose a different one.
Hello -
In the character builder, it would appear that you can currently select any tool proficiency EXCEPT thieves' tools. When, in fact, you should only get proficiency with thieves' tools.
Does you character have thieves tool proficiency from another source—like maybe their class? With backgrounds, if you get that proficiency from something else, you are allowed to choose a different one.
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Since you are playing a rogue (or artificer) that already has proficiency in thief's tools you can pick any other tool for your background instead.