

An herbal throne based on cannabis / asterion
These thrones pictured above are metaphorical.
They're places your psyche goes when under the medicinal influence of Pharmakon (drugs) or Pharmakeia (drug sorcery).
The Greek forms are:
They are formally treated as distinct nouns, and their exact etymological relationship remains disputed. But their phonetic and ritual convergence is undeniable. An ancient hearer could hear θρόνα / θρόνος / θρόνωσις together, especially when enthronement occurred during an induced initiatory state.
An ancient dialectal gloss preserved in the scholia says:
θρόνα· Θεσσαλοὶ μὲν τὰ πεποικιλμένα ζῷα, Κύπριοι δὲ τὰ ἄνθινα ἱμάτια, Αἰτωλοὶ δὲ τὰ φάρμακα, ὥς φησι Κλείταρχος.
“Throna: among the Thessalians, ornamented figures; among the Cypriots, flower-patterned garments; but among the Aetolians, pharmaka, as Cleitarchus says.”
Another ancient explanation is even more direct:
θρόνα· τὰ θρονύοντα τὸν νοῦν ἢ τὰ θροῦν ποιοῦντα ἐν τῷ νοΐ.
Throna: things that agitate/stir the mind, or things that produce disturbance/noise within the mind.
Eustathius explains:
Θρόνα δὲ κυρίως μὲν τὰ ἐκ θηρίων ἢ τὰ ἐκ γῆς ἀναθορόντα ὀνήσιμα φάρμακα, νῦν δὲ κατὰ μετουσίαν θρόνα, ἤγουν φάρμακα, ἔφη τὰ βεβαμμένα λίνα ἢ ἔρια.
Properly, throna are the beneficial pharmaka derived from thēria (beasts) or springing from the Earth; but here, by transferred usage, he called the dyed linen threads or wool throna-that is, pharmaka.
That is stronger than simply “herbs.” Throna may be substances obtained from plants/Earth or from animals-ἐκ θηρίων. That leaves room for venom and other animal-derived pharmaka. The surviving ancient glosses are collected with their sources here.
In Theocritus’ Pharmakeutria, the woman first prepares an animal-derived drink:
σαύραν τοι τρίψασα κακὸν ποτὸν αὔριον οἰσῶ.
Having ground up a lizard, tomorrow I shall bring you a potent/harmful drink.
She immediately orders Thestylis to take the throna and smear them upon the entrance:
Θεστυλί, νῦν δὲ λαβοῖσα τὺ τὰ θρόνα ταῦθ᾽ ὑπόμαξον
τᾶς τήνω φλιᾶς καθ᾽ ὑπέρτερον, ἇς ἔτι καὶ νύξ·
Thestylis, now take these throna and rub/smear them upon the upper part of that man’s doorway, while it is still night.
The cluster is exact:
Theocritus, Pharmakeutria 2.58–62, Greek text
So the sequence makes sense:
In that ritual register, “sitting on the throne” can indeed operate like drug slang: being seated within, mounted upon, or stabilized inside the pharmakon-induced condition.
The throne is the outward office.
The throna are the inward ordeal that qualifies the ruler.
John says:
καὶ τὸ θηρίον ὃ εἶδον … καὶ ἔδωκεν αὐτῷ ὁ δράκων τὴν δύναμιν αὐτοῦ καὶ τὸν θρόνον αὐτοῦ καὶ ἐξουσίαν μεγάλην.
And the thērion that I saw … and the drakōn gave it his power, his throne, and great authority.
Or succinctly:
The drakōn gave the thērion its power and its throne.
See Pharmakon
Then:
καὶ εἶδον γυναῖκα καθημένην ἐπὶ θηρίον κόκκινον
And I saw a woman seated upon a scarlet thērion (beast).”
And:
τοῦ θηρίου τοῦ βαστάζοντος αὐτήν
The thērion carrying her.
She is simultaneously under the influence and in command of the scene:
Κάθημαι βασίλισσα
I sit as Queen.
She is intoxicated riding the beastly venoms, on her throne, causes the nations to drink her preparation, her "wine" from her "cup", and leads them through pharmakea (φαρμακεία). The serpent gives the beast (thērion) its power and throne; the Queen sits upon and rides that serpent-derived power.
Thus “riding the beast” describes mastery of the throna-including the animal-derived pharmakon ἐκ θηρίων. The physical throne (θρόνος) marks the person who has survived, mastered and been transformed by the throna (θρόνα).
She is Queen precisely because she can ride the beast / venom without being destroyed by it.