Word for "to remove the soul" like decapitate/behead "to remove/cut off the head"
Solution 1:
desoul (v.)
(Transitive) To strip of a soul.
1998, Shirley Boteler Mock, The Sowing and the Dawning, page 38: The crucial shared features are desouling, release of the soul from its “vessel,” and travel by transformation from one level of existence to another through a portal linking levels.
2005, Robert B. Clarke, An Order Outside Time […] there followed centuries of the exploration of matter that has led to the matter-worship of our modern age and the desouling of the world. Wiktionary
On the contrary, he said, employing a line of reasoning that would reappear again and again in the later history of natural theology and especially in the post-Darwin period, natural philosophers could desoul the natural world all they wanted: it only added to the staggering marvel of its so-called machinery and made it all the more impossible to account for its origin without God, since ... Wallace Marshall; Pluritanism and Natural Theology (2016)
The latter point is important in the light of René Fulop-Miller's charge in The Mind and Face of Bolshevism that the effect of Bolshevik mechanisation was to 'desoul'... art. Jonathan Pitches; Science and the Stanislavsky Tradition of Acting (2005)
The weakest point in any of them is the effort to desoul mankind. Gibson Andrews; The Story of Creation (1900)
Befitting a paganist worldview, Gumilev is inclined to “ensoul” nature and “naturalize” or “desoul” the human. Mikhail Epstein; Ideas Against Ideocracy (2021)
“I'm surprised it didn't desoul the mother,” he answered. Harry Turtledove; The Case of the Toxic Spell Dump (2015)
What was needed according to Jung's viewpoint was both an appreciation of the mythos perspective in a regrettably demythologized and desouled world as well as accountability to the rationally critical functions represented by the logos point of ... Walter Shelburne; Mythos and Logos in the Thought of Carl Jung (1988)
In fact , the process of history has involved a devitalizing and desouling reminiscient of Max Weber's notion of disenchantment.
...
Not only does the mechanistic viewpoint disenchant the organic world, but also a certain devaluation, despiritualization, and desouling of the world must have preceded that viewpoint's emergence. Michael Barber; Guardian of Dialogue (1993)
Therefore, after touching on the problem of isolation, Scheler directs the full force of his criticism against the desouling of subhuman nature and opposes it with the theory of the mind as the characteristic distinguishing man from the animal. E. Voegelin and K. Vondung; Race and State (1997)
The moral appears to be the desiccating, desouling influence of the conception of a world without a personal God or a definite moral law. Journal of Religious Psychology, vol. 2, p.140 (1907)
Solution 2:
Eviscerate, in its figurative sense, might work here:
The creature eviscerated him and turned him into an empty shell of flesh and blood, shortly destined to become dust.
eviscerate, v.
2. In various figurative applications.
a. To draw out what is vital or essential in (any thing); to elicit the ‘pith’ or essence of. rare.
1664 J. EVELYN Sylva Pref. to Rdr. They..as it were eviscerating Nature..have collected innumerable Experiments, etc.
1768 W. BLACKSTONE Comm. Laws Eng. III. 205 To prevent fraud and chicane, and eviscerate the very truth of the title.
1872 O. W. Holmes Poet at Breakfast-table ix Some single point I could..eviscerate and leave..settled.b. To empty of vital contents; to deprive (an argument, institution, enactment, etc.) of all that gives it value or importance.
1834 Blackwood’s Mag. 36 329 France was eviscerated of all the nobler organs which once gave it a European existence.
1845 W. SEWELL Hawkstone I. 79 The hymn..was..one of Watts’ which Mr. Priestley had previously eviscerated of all peculiar doctrines.
1881 Daily News 15 Feb. 2/1 Amendments intended to eviscerate the clause were moved by Dr. Commins..and others.Source: Oxford English Dictionary (login required)