Wan Dap Luang

Ritual purpose

Authority/decha, metta-mahaniyom, danger avoidance, protection from lightning, general protective auspiciousness. Facebook seller posts sharpen the danger-protection claim into explicit black-magic protection ("ป้องกันภัย คุณไสยมนต์ดำ") and home-guarding invulnerability.

Botanical

Probably Hymenocallis sp. (Amaryllidaceae) per BanVanThai — sword-like glossy green leaves, pale green swollen bulb, fragrant white flowers. May substitute for ว่านดาบนารายณ์ in an eight-direction protection rite.

Origin / legend

No plant-specific legend beyond the sword/authority name in blog sources. Farm Suksabuy gives a broader origin for a group of eight protective waan: old virtuous adepts allegedly devised an eight-plant boundary method to deter hostile forces, thieves, and enemies without retaliating harmfully — a lineage-style origin for the rite, not for this single plant. A Facebook waan-conservation group post adds a specific (unverified) origin claim: the plant's original home is said to be Battambang, from when it was still considered Thai territory ("ถิ่นกำเนิดเดิมของว่านนี้มากจากเมืองพระตะบองสมัยที่ยังเป็นแผ่นดินไทยแต่ก่อน").

Consecration method (ปลุกเสก)

Part of an eight-direction protective-waan rite (substituting for ว่านดาบนารายณ์ in the south-direction pot): prepare eight protective plants in pots; place a small bundle of empowered ritual items at the bottom of each; add an inscribed copper/lead plate and clean soil; plant Thursday morning ~06:00-07:30 facing north; light 3 incense sticks, invite the waan, circle the pot clockwise, make oath recitations, then water with consecrated water.

Katha (คาถา)

• ปิสัมระโลปุสัตพุท

  pi sam ra lo pu sat phut

  South-direction esoteric formula named as "Narai churning the ocean" in the eight-direction rite.

• เอหิตาตะ ปิยะพฤษตะ ปุเรถะ มะมะ ปะระมิง หัตถะยัง เม พิสันเจถะ กะโรวะจะนัง มะมะ

  ehi tata piya phruetta puretha mama paraming hatthayang me phisan chetha karo wachanang mama

  "Come here, beloved plant; come into my keeping and act according to my word" — plant-invitation katha.

• พุทธัง ชัยยะมังคะลัง ธัมมัง ชัยยะมังคะลัง สังฆัง ชัยยะมังคะลัง

  phutthang chaiya mangkhalang; thammang chaiya mangkhalang; sangkhang chaiya mangkhalang

  "Victory-auspiciousness of the Buddha, Dhamma, and Sangha" — watering formula.

Application

Primarily planted/kept as a protective house plant, placed in a specific protective pot as part of an eight-direction house/compound boundary rite. A Facebook group post ("๙ ว่านในตำรา ๑๐๘ มวลสาร ๙") gives a more direct standalone use: grind the bulb to apply, or mix it into bathing water, so that blades and weapons will not harm the skin ("คมดาบค่ะศาสตราวุธทั้งปวงจะไม่ระคายผิว").

Taboos / restrictions (ข้อห้าม)

• Keep above waist level; do not place near clotheslines or treat roughly; no food/dirty things in the pot; menstruating women should not touch them; water with the prescribed katha. These belong to the eight-protection-plant rite, not necessarily casual planting.

Sources

• BanVanThai, "ว่านดาบหลวง"
• Farm Suksabuy, "ว่านที่ใช้ป้องกันเภทภัย"
• Thai waan-conservation Facebook group, ว่านดาบหลวง post
• Facebook group, "๙ ว่านในตำรา ๑๐๘ มวลสาร ๙"