Through the various adventures, the big plot emerging is that Orcus, Lolth, Yeegnohu and others are taking advantage of the death of all the Sun Gods, but no one has yet confirmed or not if they have any actual involvement in it. They suspect Orcus.
In truth it is all going to be Tharizidûn. This is something I have built up over the last couple of campaigns. The "Dragonslayers" (the generation before the "Order of the Platinum Dragon") uncovered the Forgotten Temple of Tharizdûn. His big plan, of course, is to get free.
Currently, I have him in a cage deep in the lowest part of the Nine Hells. Asmodeus is still his jailer and in many ways is the very first Warlock of Tharizdûn. He has been siphoning off Tharizdûn's power for centuries, it is how he took control of Hell in fact. But Tharizdûn knows this and while Asmodeus has been doing this, Tharizdûn has been pulling him deeper and deeper into his thrall.
In my games Tharizdûn also has another title, "The Whispering God". This comes from his warlocks who say their god whispers in their ears and tells them secrets. And convinces them to do terrible things. He is also known as the Elder Elemental Eye and worshiped by elemental-demon cults. He is also worshiped by the Drow that do not follow Lolth.
Recently Strange Brew: Warlocks was released. It includes a version of the Whispering God that I used in my games. I am particularly proud of it to be honest.
WARLOCK PATRON: THE WHISPERING GODFor Pathfinder this is a "Cthonic" Patron. For D&D 5 this would be an "Old One".
Deep in forgotten tombs, hidden in forsaken forests, and haunting long-abandoned churches of long-dead gods, you can hear it. It is soft, but it is there. Once you hear it, then it is always with you—day and night, sleeping and waking. It is the voice of the Whispering God. No one is for sure who or what the Whispering God is.
There are no churches or priests dedicated to him. No stories of creation. No heroes. No tales of battles. Just the constant whispering. Those warlocks who follow this entity are blessed and cursed: blessed with great power and cursed with the voice of their patron in their ears forever. No one knows what the Whispering God wants or even why he/it needs warlocks and not clerics.
The speculation is that he is a god trapped in prison so dark and so perfect only his voice can escape, but just barely. He needs these warlocks to spread the word so he can escape. Others claim that the god is nothing more than the madness that will consume all “his” warlocks.
For my players, it means trouble.
Here is a Cthonic Tradition for the Basic Era Witch.
New Tradition: Cthonic
Witches of the Cthonic Tradition honor and some say are slaves of, very, very ancient powers. Some are inhuman powers from beyond our reality and understanding. Some are ancient Primordial Beigns from before the times of gods or mortals. A few are Dead Gods whose worship continues and whose power remains.
More so than any other witches, these are most often called Warlocks.
Role: These witches and warlocks represent a tie to the ancient past or to other unworldly powers. They represent classical villains or the scholar that has delved too deep into things that mortals were never meant to know.
Joining this Tradition: To join one must either discover the Cthonic Patron of be discovered by one. For example, the Cult of the Whispering God hears their Patron's whispers when they uncover hidden knowledge about the God or venture deep into areas that were formerly His centers of worship.
These witches tend to be Solitaries or be involved in small cults.
They are for the most part are chaotic, with some gravitating towards neutral. Rare is the lawful Cthonic witch, but it is not unheard of.
Leaving this Tradition: Often there is no way to leave this tradition; not even in death.
Minor - 1st Level: Grimoire. The warlock does not gain a familiar like other witches, but rather a semi-aware tome known as a Grimoire. These tomes replace the Book of Shadows for these witches. These Grimoires are often sought after by occultist, magic-users.
Lesser - 7th Level: Immune to Fear. Exposed to so many horrors or alien minds warps the mind of the warlock to a point where normal fear has no effect on them. Magical fear is also given a -4 bonus on saves.
Medial - 13th Level: Alien Mind. The Cthonic witch has become so accustomed to dealing with alien and ancient minds that she becomes immune to charm and hold spells. Her mind can't be probed or read via telepathy, ESP or similar powers.
Major - 25th Level: Shape Change. Once per day, the witch may change her shape to any type of aberrant monster, like the spell Shape Change. For 1 turn per level, the witch may move freely back and forth between her aberration and human forms. Once the form is chosen, that is the only form she can use for the day. So, a witch may choose to change between the forms of human and a roper but cannot go between roper, human and bird. Once the duration has expired, the witch reverts back to human form. The witch does not have the special abilities of the aberant form save for those that she can manage with the form. So the roper's tentacles would be replicated, but not the basts of a Sphere of Many Eyes.
Superior - 31st Level: Apotheosis. The witch becomes something else. This new form and powers are dependent on the Patron she serves. For witches of the Whispering God her voice barley rises above a whisper, but her voice can be used as a Command spell once per day, a Charm spell 3 times per day, and a suggestion seven times per day.
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