Those of roguish training often utilize different devices to accomplish their ends: a grappling hook, a rope, a set of tools. However, some archetypes require tools of a more advanced nature than a metal hook on the end of a hempen rope. Gadgeteers engineer their tools using magical and/or scientific techniques based on the magic of artifice and invention.

The Click-Blade royal spies of the Underdark city of Nickelvale all follow these practices, and periodically have need for recruits. A gadgeteer can easily become the favored agent of a criminal leader or government group, considering how their tools can help others on a mission. In places of invention, a gadgeteer might be commissioned to take down rivals or steal their projects.

Tinkerer

When you take this subclass, you gain proficiency in tinkerer’s tools. If you’re already proficient, you gain proficiency in a skill of your choice. When choosing proficiencies for Expertise, you can choose tinkerer’s tools.

Gadget Crafting

When you choose this archetype at 3rd level, you gain the ability to fashion magical marvels of artifice. You may choose four infusions from the Artificer Infusions list of the artificer class. You learn additional infusions of your choice when you reach certain levels in this class, as shown in the Infusions table.

Whenever you learn a new infusion, you can replace one of the infusions you previously learned with a new one.

Some infusions specify a minimum artificer level. You can’t learn such an infusion until you are at least twice that level of rogue.

Unless an infusion’s description says otherwise, you can’t learn an infusion more than once.

Infusing an Item

Whenever you finish a long rest, you can touch a non-magical object and imbue it with one of your infusions, turning it into a magic item. An infusion works on only certain kinds of objects, as specified in the infusion’s description. If the item requires attunement, you can attune yourself to it the instant you infuse the item. If you decide to attune to the item later, you must do so using the normal process for attunement (see “Attunement” in chapter 7 of the Dungeon Master’s Guide).

Your infusion remains in an item indefinitely, but when you die, the infusion vanishes after a number of days have passed equal to your Intelligence modifier (minimum of 1 day). The infusion also vanishes if you give up your knowledge of the infusion for another one.

You can infuse more than one nonmagical object at the end of a long rest; the maximum number of objects appears in the Infused Items column of the Infusions table. You must touch each of the objects, and each of your infusions can be in only one object at a time. Moreover, no object can bear more than one of your infusions at a time. If you try to exceed your maximum number of infusions, the oldest infusion immediately ends, and then the new infusion applies.

If an infusion ends on an item that contains other things, like a bag of holding, its contents harmlessly appear in and around its space.

Infusions

Rogue Level	Infusions Known	Infused Items
3rd	4	2
9th	5	3
13th	6	3
17th	7	3
20th	8	4

Implements in Disguise

Starting at 9th level, you are able to disguise your tools as everyday objects. Unless you choose otherwise, your infused items appear to be ordinary objects or mundane trinkets until in use. Additionally, any check made to discern the purpose or use of one of your infused items has disadvantage.

Improvised Solution

Starting at 13th level, you have gained the skill necessary to change your gadgets to suit your needs on the fly. While holding tinkerer’s tools, you can use your action to uninfuse an infused item in your possession and infuse an item in your possession with an infusion you know.

Once you do, you can’t do so again until you finish a short or long rest.

Gadget Expert

When you reach 17th level, you have become quite adept at constructing gadgets, such that you are able to create a very wide variety. Whenever you take a long rest, you can change your list of Artificer infusions known with other valid infusions on the Artificer Infusion list.

Additionally, your number of uses for Improvised Solution increases to two.