Deepstone is a deep black aquatic material that is mined from the bottom of the Endless Sea in the world of Ninjago. The molecules that Deepstone consists of are constantly moving, yet still staying solid; making it an effective material for utilization in both combat and defense against ghosts, since it has the same effect on ghosts as Vengestone does on the Elemental Masters.
One of its uses is to forge Aeroblades, a shuriken-like weapon that is highly effective against ghosts. It was also forged into armor, along with vehicles, for the ninja to aid them in their fight against the Preeminent.
When the four original ninja encounter Ronin in his pawn shop, he offers them Aeroblades and explains they were made from the material of Deepstone, selling them for an expensive price. After Morro and his Ghost Warriors attack Ronin at his shop, the ninja use the Aeroblades to gain an advantage over the ghosts.
Kai, Zane, Nya and Jay (except Cole, who was turned into a ghost) received added Deepstone armor on their suits. Wu explains to them that the armor, while heavier, does protect them from being possessed by ghosts. As the Soul Archer fires an arrow at Kai, the Deepstone was proven to prevent him from turning into a ghost. After Zane defeated Ghoultar and sent him off the Wailing Alps with his Ice Mech, Wu, Ronin, Nya and Misako trapped him in a cage with Deepstone bars.
After being freed of Morro's possession, Lloyd began to wear Deepstone armor.
Infamous through The Last Resort
Nya would continue to wear her Deepstone armor until halfway in "The Last Resort". She is even seen wearing it after Jay's final wish in "The Way Back".
- 47. "Stiix and Stones"
- 48. "The Temple on Haunted Hill"
- 49. "Peak-a-Boo"
- 50. "Kingdom Come"
- 51. "The Crooked Path
- 52. "Grave Danger"
- 53. "Curseworld, Part I"
- 54. "Curseworld, Part II"
- 55. "Infamous"
- 56. "Public Enemy Number One"
- 58. "Misfortune Rising"
- 59. "On a Wish and a Prayer"
- 60. "My Dinner With Nadakhan"
- 61. "Wishmasters"
- 62. "The Last Resort"
- 63. "Operation Land Ho!"
- 64. "The Way Back"
- 1. "Master Class" (painting)
- 2. "Green and Gold" (painting)
- 3. "The Weekend Drill" (painting)
- 4. "Elemental Rider" (painting)
- 5. "Blue Lightning" (painting)
- 6. "Samurai X-Treme" (painting)
- 99. "Wasted True Potential" (painting)
- 1. "Let's Dance" (painting)
- 145. "Shintaro" (painting)
- 165. "A Big Splash" (painting)
- 5. "Golden Hour" (flashback)
- 1. "Curiosity" (painting)
- Black katanas, referred to as Deepstone Katanas, were used by the ninja and Ronin in the Possession sets.
- Deepstone is fairly similar to Vengestone, as they are both able to prevent ghosts from phasing through them.