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From Xanathar's Guide:
Tool Descriptions
The following sections go into detail about the tools presented in the Player’s Handbook, offering advice on how to use them in a campaign.
Components. The first paragraph in each description gives details on what a set of supplies or tools is made up of. A character who is proficient with a tool knows how to use all of its component parts.
Skills. Every tool potentially provides advantage on a check when used in conjunction with certain skills, provided a character is proficient with the tool and the skill. As DM, you can allow a character to make a check using the indicated skill with advantage. Paragraphs that begin with skill names discuss these possibilities. In each of these paragraphs, the benefits apply only to someone who has proficiency with the tool, not someone who simply owns it.
With respect to skills, the system is mildly abstract in terms of what a tool proficiency represents; essentially, it assumes that a character who has proficiency with a tool also has learned about facets of the trade or profession that are not necessarily associated with the use of the tool. In addition, you can consider giving a character extra information or an added benefit on a skill check. The text provides some examples and ideas when this opportunity is relevant.
Special Use. Proficiency with a tool usually brings with it a particular benefit in the form of a special use, as described in this paragraph.
Sample DCs. A table at the end of each section lists activities that a tool can be used to perform, and suggested DCs for the necessary ability checks.
Disguise Kit
The perfect tool for anyone who wants to engage in trickery, a disguise kit enables its owner to adopt a false identity.
Components. A disguise kit includes cosmetics, hair dye, small props, and a few pieces of clothing.
Deception. In certain cases, a disguise can improve your ability to weave convincing lies.
Intimidation. The right disguise can make you look more fearsome, whether you want to scare someone away by posing as a plague victim or intimidate a gang of thugs by taking the appearance of a bully.
Performance. A cunning disguise can enhance an audience’s enjoyment of a performance, provided the disguise is properly designed to evoke the desired reaction.
Persuasion. Folk tend to trust a person in uniform. If you disguise yourself as an authority figure, your efforts to persuade others are often more effective.
Create Disguise. As part of a long rest, you can create a disguise. It takes you 1 minute to don such a disguise once you have created it. You can carry only one such disguise on you at a time without drawing undue attention, unless you have a bag of holding or a similar method to keep them hidden. Each disguise weighs 1 pound.
At other times, it takes 10 minutes to craft a disguise that involves moderate changes to your appearance, and 30 minutes for one that requires more extensive changes.
Disguise Kit
Activity | DC |
Cover injuries or distinguishing marks | 10 |
Spot a disguise being used by someone else | 15 |
Copy a humanoid’s appearance | 20 |
This message was last edited by the player at 19:06, Mon 14 May 2018.