Staff of Eldritch Focus

Many warlocks throughout history have attempted to make the most of the power they have been given by their patrons, but woefully few thought to turn to technological advances to enhance their abilities.

Construction

The Staff of Eldritch Focus, while possible to find in the world, is most commonly designed and built by a warlock with the inclination and ability to design such a device. For the Staff's construction, the following materials are required:

1 Quarterstaff

1 Diamond, Emerald, Ruby, or Sapphire worth at least 1000 gp

200 gp worth of miscellaneous parts for the gem housing

Between 1 and 2 days is normally required by a proper smith to build the housing for the gem, after which the staff must undergo a period of 24 hours of cumulative enchantment by the warlock who intends to use it. These 24 hours must occur within 1 week, or the magic is lost, and the enchanting process must start over again.

Function

While it is possible to modify many spells with sufficient study and practice, the main focus of this staff is to alter a warlock's Eldritch Blasts. The Staff of Eldritch Focus allows the user to change the effects of their Eldritch Blast with a quick twist of a dial beneath the gem, used as the focusing lens. This adjustment may be done as a bonus action. This item requires attunement to be used properly.

Blast Modifications

Repulsion- Significantly widen the area of effect of your Eldritch Blast, at the cost of damage. The Blast widens out to a 30-foot cone, and all creatures in the area of effect take 1d4 force damage per beam on an unmodified blast, and must make a Strength saving throw. On a failed save, they are thrown back 10 feet, and all Medium or smaller creatures are knocked prone. On a successful save, they are pushed back 5 feet and are not knocked prone. The level of focus that this takes away from the wielder's Eldritch Blast makes the wielder unable to use any of their blast invocations when channeling it through this focus level.

Penetrating Shot- At the other end of the spectrum, tighten your blast to a laser-focus, enhancing damage and piercing through multiple enemies. This reduces your Eldritch Blast down to a single beam which deals 1d12 Force damage per beam on an unmodified blast. It's range is also reduced to 60 feet, potentially affecting all enemies within its line. If it hits the first enemy in the line, the concentrated force propels it through them to the next enemy, who you must make a separate attack roll for. Repeat this until you miss or until the blast hits the end of its 60 feet. The level of concentration this requires also negates the ability to use any blast invocations.

Energy Replacement- Alternatively, the diamond used as the focusing lens can be swapped out for a ruby, emerald, or sapphire also worth 1000 gold or higher. If this is the case, the wielder may choose to have their blast deal half of its damage rolled as cold, fire, poison, or lightning, and the rest remains force damage. Blast invocations may be added to blasts made through this modification, and this modification may be used in addition to any other modification.

Scattershot- Use the many facets on the focusing lens to create a storm of blasts, at the cost of damage and focus. Double the number of beams sent out by your Eldritch Blast, but each one has its range reduced to 60 feet, and deal 1d8 force damage instead. In addition, due to the scattered nature of this setting, attempts to focus the attack are difficult. If you attempt to direct more than one beam towards a single target, each beam beyond the first makes its attack roll with disadvantage. Further, these smaller beams lack the kinetic energy of an unaltered blast, and thus cannot be used in conjunction with the Repelling Blast invocation.