• pāpīyān — the sinful one
  Comparative of pāpa — even more sinful (than other asuras already named). Bhāgavatam's grading: Vṛka has graduated past Rāvaṇa-class boon-seekers — he asks not for power-over but for instant-death-over.
• bhūta-bhaya-āvaham — bringing fear to all beings
  Contiguous (bhūta + bhaya + āvaham). Āvaham = bringing along. The boon's whole content is the importation of fear into the universe. Compare Kṛṣṇa, who comes precisely to remove bhaya (abhayam, BG 16.1).
• yasya yasya — of whomever (and whomever)
  Doubled relative — universalized. The boon excludes no one — neither devotee nor child nor lord. Vṛka has built a weapon that, by its construction, must eventually be turned on the giver.
• karam śīrṣṇi — the hand on the head
  Contiguous (karam + śīrṣṇi). The gesture of blessing inverted into the gesture of execution. Gauḍīya pathos: the same hand-on-head that a guru uses in compassion.
• mriyatām — let him die
  Third-person imperative of √mṛ. Death — not on the bearer's terms, but on the asura's whim. The Bhāgavatam stages the moment so the reader can see the geometry: a boon shaped like a guillotine.

Asked to write any wish on a blank cheque, a man writes 'death by my touch upon all heads.' The verse names what asurya actually wants when nothing constrains it: not pleasure, but the power to kill at will. Bhakti and asurya choose differently with the same pen.