How unfortunate joyous an occasion! Our Prince of Darkness True Savior is with us once again!
You now wield the full might of the Alternate threat, being the Unspeakable, inciting their birth (either directly spawning them or manipulating others to birth them as Tulpas) and molding them to your devilish whims. The Alternates are in reality a collective of demonic beings acting the will of their creator to topple God's order with theirs.
A distinguishable ability of Alternates of how they diverge from common devilry, their more artful and insidious tactics range from supplanting others from their own, able to shapeshift or even assimilate their victims gaining their visage while also emulating their voice to further deceive everyone around them, this creating ambiance of paranoia and/or distrust of their environment and society furthers eases the victims to be susceptible to the Alternates' psychological warfare, isolating and wearing down at the victim's psyche inflicting them with a particular illness, called M.A.D (Metaphysical Awareness Disorder), consisting of "giving information not desired to be known", put simply an infohazard that ravages the target's mind maddening them to put an end to it themselves.
Another thing to note is how they're not fully tangible beings, showcasing other abilities such as flight/levitation, camouflaging in the shadows, and teleporting, among other unseen capabilities. Alternates are shown to be extremely difficult to harm or kill, and common methods of defense such as firearms aren't enough to deter them. Good thing they know and exploit this fact to mock their helplessness.
Being the sole creator, their fate solely resides with you, whether you use it to its rightful use is up to you.