Tools of the Trade

3rd level Combat Engineer feature

You gain proficiency with hand crossbows and heavy crossbows. You also gain proficiency with mason's tools. If you already have this proficiency, you gain proficiency with one other type of artisan’s tools of your choice.

Combat Engineer Spells

3rd level Combat Engineer feature

You always have certain spells prepared after you reach particular levels in this class, as shown in the Combat Engineer Spells table. These spells count as artificer spells for you, but they don’t count against the number of artificer spells you prepare.

Hasty Trencher

3rd level Combat Engineer feature

You learn the mold earth cantrip and can cast it as a bonus action.

Arcane Barriers

3rd level Combat Engineer feature

You can utilize strong abjuration magic to create barriers that protect your allies and allow greater positioning. As a bonus action, you can create a translucent wall of magic at a point you can see within 60 feet of you. The wall is 1 inch thick and can be up to 10 feet in either length or height. It appears in any orientation you choose, as a horizontal or vertical barrier, and it must be touching a solid surface or another arcane barrier. Alternatively, you can create a staircase that fits within a 5-foot cube, facing any orientation.

Each arcane barrier you create has AC equal to 12 + your intelligence modifier, and a number of hit points equal to three times your artificer level. After creating an arcane barrier, it lasts for 10 minutes or until you dismiss it as a free action on your turn. The barrier breaks early if it's reduced to 0 hit points or if you are knocked unconscious. You can maintain a number of arcane barriers at the same time equal to your Intelligence modifier. If you try to exceed your maximum, you choose one of the arcane barriers currently up and it immediately disappears.

Vantage Point

5th level Combat Engineer feature

Tactical possitioning opens new ways get the upper hand over your enemies. Whenever you make a ranged attack from within 5 feet of one of your arcane barriers, you can roll 1d6 and add the result to the attack roll and damage roll.

Mystical Architect

9th level Combat Engineer feature

You have mastered the art of swiftly creating barricades in combat. The maximum number of arcane barriers you can maintain at the same time doubles. In addition, you can create two arcane barriers as part of the same bonus action.

Instantaneous Fortress

15th level Combat Engineer feature

By focusing your skills in both magic and tactical engineering, you can create an arcane fortress to defend you and your allies in battle. As an action, you can create a walled fortress around you that encompasses an area of up to 150 squared feet. The wall of the fortress can be anywhere from 5-feet to 15-feet tall, and it must close in on itself. You may also create a watchtower within the fortress that's between 5 and 15 feet in diameter, and up to 30 feet in height.

The walls of the fortress and watchtower can be equipped with windows, doors, arrowslits and crenellations in any way you desire, but it contains no weapons or furniture inside.

The fortress is made of the same magical essence as your arcane barriers, though its walls are opaque and much sturdier. Each 5-foot segment of the walls and watchtower has AC equal to 15 + your Intelligence modifier, and a number of hit points equal to five times your artificer level. The fortress lasts for 1 hour, or until you dismiss it as a free action on your turn. If you die, the fortress disappears after 1d4 rounds.