Karis Venner's trench shovel
This seemingly ordinary trench shovel is imbued with powerful magic. It can be used as both a tool and a weapon. While holding this shovel, you gain the following benefits:
To hit: STR+Proficiency+2; 5ft; Magical 2d10/2d12 bludgeoning+STR+Proficiency+2
Borrower's Aid: As an action, you can use the shovel to dig a 5-foot diameter tunnel through earth, loose rock, or similar material. The tunnel collapses after 1 hour unless supported by other means.
Earthen Grasp: You can cast the Maximilian's Earthen Grasp spell from the shovel once per day. This does not require material components.
Terramancer's Blessing: You gain a +2 bonus to attack and damage rolls made with this shovel, which counts as a magical weapon. Additionally, when you hit a creature made of earth, clay, stone, or similar material with an attack using the shovel, the creature takes an extra 2d8 force damage.
Earth Glide: While holding the shovel, you can move through nonmagical earth and stone as if it were air, leaving no tunnel or track behind. This ability can be used for a total of 10 minutes per day, which can be spread out over multiple uses.