Wan Phet Na Thang

Ritual purpose

Primary: คงกระพันชาตรี / body invulnerability. Secondary: metta/attraction, amulet/phra-khrueang mass material; the Khao Or-linked lore adds protection from sorcery, ghosts, and malevolent beings.

Botanical

Gagnepainia thoreliana (Baill.) K.Schum. (Zingiberaceae), confirmed by a Thai Royal Institute botany paper. Small tubers are sometimes called ว่านเพชรหน้าท้อง/ห้อง; large tubers ว่านค้อนหน้าทั่ง. Not to be confused with non-plant "เพชรหน้าทั่ง" mineral amulets.

Origin / legend

A Palungjit forum post quoting Khao Or / Wat Don Sala ritual material associates it with a southern "กินว่าน" rite said to involve guardian spirits and a 1930 rite at Wat Don Sala — ritual-history lore, not a botanical legend.

Consecration method (ปลุกเสก)

Minimal eating rite: eat the tuber only after reciting the katha 3 times. A fuller forum-quoted Khao Or rite: select an auspicious time, loop sacred thread around the plant, offer betel/areca to its guardian, have it consecrated by the presiding ritual master, then distribute for eating.

Katha (คาถา)

• นะโมพุทธายะ

  na mo phut tha ya

  Homage to the Buddha; recited 3 times before eating the tuber.

Application

Eaten as tuber/root; also used in amulet/phra-khrueang mass-material lists.

Taboos / restrictions (ข้อห้าม)

• No herb-specific taboo found; the fuller Khao Or rite requires auspicious timing and guardian offerings as procedure, not taboo.

Sources

• BanVanThai, "ว่านเพชรหน้าทั่ง"
• Chayan Picheansoonthon & Suppachai Tiyaworanant, "Gagnepainia K. Schum."
• TrueID Horoscope