Raxan seaweed

"Xim&mdash;I am wedded to you by the lance, forged by the craftiest of all Duin smiths, its handle twined in Raxan seaweed, its vamplate a kiirium mirror like my mail, its shaft a stake for slugs and all their slime, its barb sprinkled with malkite, a deathknell to all who would poison our union."

- An excerpt from The Gleam of Kiirium by Asenec of Crakull

Raxan seaweed was a species of seaweed. In his poem about the Tionese despot Xim, The Gleam of Kiirium the Croke poet Asenec made mention of the seaweed. The character from whom's perspective the poem is told, a Duinarbulon Star Lancer, describes their lance as having a handle wrapped in the plant.

Behind the scenes
The Parade Grounds were supposed to be first mentioned in The Essential Guide to Warfare, a sourcebook released in 2012 written by Jason Fry and Paul R. Urquhart, but they were ultimately cut from the final product. The section including the grounds was later published as part of Star Wars: The Essential Guide to Warfare: Author's Cut, a series of articles published on the StarWars.com blog starting in 2013.

Soures

 * The Essential Guide to Warfare