The Spellweaver

Otherworldly Patron
Comments from the Finger: This warlock makes use of one of the best forgotten monsters from D&D past. Special thanks to Jaridase Zasmyocl for making this one happen!

The Spellweaver

Your patron is a spellweaver, one of a race of powerful creatures from an alternate Material Plane. Only vaguely humanoid in appearance, spellweavers have a combination of mammalian, reptilian, and insectoid features, and three pairs of arms. As strange as your patron’s appearance is, his motivations are twice as mysterious. Spellweavers only reveal themselves in area of great magical activity, but can weave powerful, exotic spells using their six arms. If your patron offers you directive, it is a subtle voice in your mind, and it often commands you to acquire powerful magic items and long lost spells.

Spellweaver Expanded Spells

Weaver’s Knots
At 1st level, your patron shows you the knots in the Weave of magic. You have a number of knots equal to your Charisma modifier, which you can expend to gain a variety of benefits. You regain 1 Weaver’s Knot when you expend a spell slot of level 1 or higher, and you recover all of your knots when you complete a short or long rest.
     You can expend 1 knot to use one of the following abilities:

• As a reaction, you gain advantage on a single Constitution check.
• As a bonus action, you recover expended hit points equal to you Charisma modifier.
• When you cast a cantrip, you can increase the damage against 1 target by your Charisma modifier.

Warp Arcana
Starting at 6th level, you can use your action to reverse the polarity of magic around you. Until the end of your next turn, you take no damage from spells. Rather, you regain expended hit points equal to half the damage you would have taken, to a maximum of your warlock level. After using this ability, you must finish a short or long rest before you can do so again.

Arcane Backstitching
At 10th level, when you take damage from an attack or spell, you can use your reaction and expend 1 weaver’s knot to halve the damage you take.

Arcane Appendages
At 14th level, your patron grants you the form of a spellweaver. As an action, you can transform yourself, sprouting a pair of arms and draining your skin of color. For the next minute, your warlock spell slots are of 2nd level and you can only cast spells of 2nd level or lower. However, you can use your action to cast two warlock spells that have a casting time of 1 action, or to take the Attack action and cast a warlock spell. You also have advantage on Athletics, Acrobatics, or Sleight of Hand checks.
     After using this ability, you cannot use it again until you finish a long rest.

Eldritch Invocations

Chromatic Disk
Prerequisite: Pact of the Tome feature
Your Book of Shadows transforms into a chromatic disk, a small, flat, circular rock that refracts different colors depending on the light. The chromatic disk is indestructible, and cannot be read by anyone except for you. When you deal damage with a warlock cantrip while holding your chromatic disk, you can add 1d4 damage to one of the cantrip’s targets. Its type is your choice of acid, cold, fire, lightning, poison, or thunder damage.

Changelog: 9/19/16: Weaver’s Knot: You regain knots when you expend a spell slot of 1st level or higher, not when you just cast a spell
Warp Arcana: Should read, when you take damage from spells, not magic
Arcane Backstitching: Rather than being able to get advantage on a saving throw using this feature, you can now use it to halve damage against attacks.
Chromatic Disk: Bonus damage only against one target