The phrase
"unspeakable power" means a power or strength that is so great or overwhelming that it is difficult or impossible to describe or put into words.
Full definition
This recipe has unspeakable power!!!
Not only did he continue to receive death threats, he became increasingly aware of
the unspeakable powers that defend the status quo with violence.
Adamnan discovers that the company of saints who encircle the divine throne have acquired the power to face in all directions at once: «None turns back nor side to other, but
the unspeakable power of God has set and keeps them face to face, in ranks and lofty coronels, all round the throne, circling it in brightness and bliss, their faces all toward God,»
Calling itself Pennywise the Dancing Clown, IT is a monster of
unspeakable power that takes the form of everyone's most horrific fears.
Written by Jim Starlin, the story begins when Thanos, a cosmic supervillain inspired by DC's Darkseid and Starlin's freshman year psychology courses, collects the Infinity Gems — six powerful stones that when combined become a weapon capable of
unspeakable power.
Forge your own playstyle with different character classes and specializations: hold your ground with the Crusader Inquisitor while enemies close in on you, bring in your finesse and cunning with the Death Cult Assassin background, or use
the unspeakable powers of the Warp with the Primaris Psyker background.
Telltale is still keeping the game's story under wraps, saying only that it involves the Guardians finding «an artifact of
unspeakable power» after an epic battle.