Forge Onward!

6th-level conjuration (druid, sorcerer, wizard)

Casting Time: 1 action

Range: 90 feet

Components: V, S

Duration: Concentration, up to 10 minutes

You create a 20 foot radius, 10 foot high cylinder of thick fog centred on a point within range. The sphere spreads around corners, its area is heavily obscured, and every foot of movement though it costs 2 extra feet. It lasts the duration or until a strong wind (at least 20 miles per hour) disperses it, which takes up to 4 rounds and ends the spell. Extremely strong winds can cause the fog to disperse faster, as determined by the DM.

You and any other creature you designate when you cast the spell are immune to the effects of the fog. To such creatures, and to those with truesight, the fog obscures nothing and looks like a soft mist, with motes of light floating in the air.

The fog moves up to 10 feet in a direction you choose at the start of each of your turns, rolling along the surface of the ground. When it moves, each creature in its space must succeed on a DC 10 Strength saving throw or be moved with it. The vapors, being heavier than air, sink to the lowest level of the land, even pouring down openings. If the cloud falls on a creature, it must succeed on a DC 10 Strength saving throw or be knocked prone.

Staff, uncommon (requires attunement)

This staff has properties associated with three different buttons that are set in a row along the haft. You can press one of the staff's three buttons as a bonus action. A button's effect lasts until you push a different button or until you push the same button again, which causes the staff to revert to its normal form. Pressing a button causes the haft of the staff to change length and a spear-like point to spring from the staff’s tip, transforming the staff into a magic weapon that grants a +1 bonus to attack and damage rolls with it.

7th-level necromancy (warlock, wizard)

Casting Time: 1 action

Range: 30 feet

Components: V, S

Duration: 1 hour

This spell summons an invisible and incorporeal spirit that can possess targets at your command until the spell ends. The spirit occupies your space and moves with you while it isn’t possessing a creature. It can’t be targeted by any attack, spell, or other effect, except ones that turn undead, it can’t attack, has an Intelligence of 10, and a Wisdom and Charisma equal to your spellcasting ability score.

This spell summons an invisible and incorporeal spirit that can possess targets at your command until the spell ends. The spirit occupies your space and moves with you while it isn’t possessing a creature. It can’t be targeted by any attack, spell, or other effect, except ones that banish or turn undead, it can’t attack, has an Intelligence of 10, and a Wisdom and Charisma equal to your spellcasting ability score.

When you cast the spell and as a bonus action on your subsequent turns, you can mentally command the spirit to attempt to possess a humanoid you can see within range. Creatures warded by a protection from evil and good or magic circle spell can’t be possessed, and you can’t target a creature again if it has already succeeded on a saving throw against this casting of withering possession.

The target must succeed a Charisma saving throw or be possessed by the spirit. While possessed, the target is incapacitated and loses control of its body. The spirit now controls the body but doesn’t deprive the target of awareness. The spirit uses the possessed target’s statistics, except it retains its Intelligence, Wisdom, and Charisma, and it doesn’t gain access to the target’s knowledge, class features, or proficiencies. At the end of each of its turns, the target repeats the saving throw, taking 4d6 necrotic damage on a failed save, or ending the possession on a successful one.

On each of your turns, you can use a bonus action to mentally command the spirit possessing a creature if it is within 60 feet of you. You decide what action the creature will take and where it will move during its next turn, or you can issue a general command, such as to guard a particular chamber or corridor. If you issue no commands, the creature only defends itself against hostile creatures. Once given an order, the creature continues to follow it until its task is complete.

Weapon (longsword), legendary (requires attunement by a creature with proficiency in Arcana)

The black blade of this sword is fashioned from a sphere of annihilation, a hole in the multiverse stabilized by a magical field surrounding it. A talisman of the sphere resembling a wailing devil face is fashioned into the tarnished bronze hilt of the sword, with the blade extending from its open mouth.

When you attack with this magic weapon, you must use your Intelligence modifier, instead of Strength, for the attack and damage rolls. In addition, you can attack twice with the sword, instead of once, when you take the Attack action on your turn. You ignore this benefit if you already have a feature, like Extra Attack, that gives you extra attacks. On a hit, the sword deals 4d10 force damage instead of its normal damage die.

When you attack an object with this sword and hit, maximize your weapon damage dice against the target. Artifacts are the exception. Unless an artifact is susceptible to damage from a sphere of annihilation, the blade passes right through an artifact, leaving it unscathed.

When you attack a creature with this weapon and roll a 20 on the attack roll, that target takes an extra 2d10 force damage. Then roll another d20. If you roll a 20 you lop off one of the target's limbs, with the effect of such loss determined by the DM. If the creature has no limb to sever, you lop off a portion of its body instead.

If the sword comes into contact with a planar portal, such as that created by the gate spell, or an extradimensional space, such as that within a portable hole, the DM determines randomly what happens, using the following table.

5th-level transmutation (cleric, paladin, sorcerer, wizard)

Casting Time: 1 bonus action

Range: Touch

Components: V, S, M (a piece of platinum worth 10 gp)

Duration: Concentration, up to 10 minutes

You touch one willing creature and imbue it with the power to spew magical energy from its mouth, provided it has one. Once before the spell ends, the creature can use an action to exhale energy in a 30-foot cone, choosing one of the following options.

Sleep Breath. Each creature in the cone must succeed on a Constitution saving throw or fall unconscious for the duration. This effect ends for a creature if the creature takes damage or someone uses an action to wake it.

Repulsion Breath. Each creature in the cone must succeed on a Strength saving throw or be pushed 40 feet away from you and be knocked prone.

Slowing Breath. Each creature in that area must succeed on a Constitution saving throw. On a failed save, the creature can't use reactions, its speed is halved, and it can't make more than one attack on its turn. In addition, the creature can use either an action or a bonus action on its turn, but not both. These effects last for 1 minute or until the spell ends. The creature can repeat the saving throw at the end of each of its turns, ending the effect on itself with a successful save.

Weakening Breath. Each creature in that area must succeed on a Strength saving throw or have disadvantage on Strength-based attack rolls, Strength checks, and Strength saving throws for 1 minute or until the spell ends. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

3rd-level illusion (artificer, bard, sorcerer, warlock, wizard)

Casting Time: 1 action

Range: Self

Components: V, S

Duration: 10 minutes

You project a magical illusion that makes you appear to be trailing behind your actual location when you move, causing opportunity attacks against you to have disadvantage. Additionally, if you move at least 10 feet beforehand, you gain advantage on your first attack roll each turn.

If you take damage, the spell is suppressed until the start of your next turn. This spell is also suppressed while you are incapacitated, restrained, or otherwise unable to move.

In addition, if you teleport while under the effect of this spell, you become invisible while the illusion of you remains where in the space that you left, mimicking your movement and actions. This effect lasts until the start of your next turn.

Potion, rarity varies

When you drink this potion, you regain your highest level expended spell slot, up to a certain level. The maximum level of the expended spell slot depends on the potion’s rarity, as shown on the table below. Whatever its potency, the potion's blue liquid glimmers when agitated.

Each time you subsequently drink a potion of mana before finishing a long rest, there is a 20 percent cumulative chance of instead creating a magical explosion within you, causing you to take 1d10 force damage for each level of the maximum slot level. Thus, an uncommon potion of mana would deal 2d10 force damage.

Potion, uncommon

Hunter's oil is a rare concoction used by monster hunters to find and kill their prey. This glass jar, 3 inches in diameter, contains 1d4 + 1 doses of a crimson, gelatinous oil that smells strongly of copper. The jar and its contents weigh 1/2 pound. Each hunter's oil is designed for a particular kind of creature; for example, undead, shapechangers, or lycanthropes.

The oil gives off a faint, red glow when it comes within 120 feet of the type of creature. It can also coat one weapon or up to 5 pieces of ammunition. Applying the oil takes 1 minute, making the coated item magical for 1 hour.

Staff, very rare (requires attunement by a sorcerer, warlock, or wizard)

This staff can be wielded as a magic quarterstaff that grants a +2 bonus to attack and damage rolls made with it. While holding it, you gain resistance to fire damage and a +2 bonus to the damage roll of any spell you cast that deals fire damage.

The staff has 20 charges for the following properties. The staff regains 2d8 + 4 expended charges daily at dawn. If you expend the last charge, roll a d20. On a 1, the staff retains its +2 bonus to attack and damage roll but loses all other properties. On a 20, the staff regain 1d8 + 2 charges.

Fiery Strike. When you hit with a melee attack using the staff, you can expend 1 charge to deal an extra 1d6 fire damage to the target.

Spells. While holding this staff, you can use an action to expend 1 or more of its charges to cast one of the following spells from it, using your spell save DC and spell attack bonus: brightbolt (6 charges), burning hands (1 charge), conjure elemental (fire elementals only, 5 charges), fireball (3 charges), firebind (3 charges), flaming sphere (2 charges), scorching ray (2 charges), and wall of fire (4 charges)

Retributive Strike. You can use an action to break the staff over your knee or against a solid surface, performing a retributive strike. The staff is destroyed and releases its remaining magic in an explosion that expands to fill a 30-foot-radius sphere centered on it.

You have a 50 percent chance to instantly travel to the Elemental Plane of Fire, avoiding the explosion. If you fail to avoid the effect, you take fire damage equal to 16 x the number of charges in the staff. Every other creature in the area must make a DC 17 Dexterity saving throw. On a failed save. a creature take an amount of damage based on how far away it is from the point of origin, as shown in the following table. On a successful save, a creature takes half as much damage.

Inspired by Weight Control from Armored Core