Raid Instances

[Original Source] Some or all of the information below is from BJCasey's post in the ISX forum, he deserves all credit for the initial gathering of information.

Tower of Frozen Shadows

Tower of Frozen Shadow (x2)

Velketor’s Labyrinth

Kraytoc's Fortress of Rime (x4)
Kraytoc's Fortrress of Rime (x4) Challenge Mode

Kael Drakkel

Temple or Rallos Zek: Foundations of Stone (x4)
Temple or Rallos Zek: Foundations of Stone (x4) Challenge Mode

Throne of Storms: Hall of Legends (x4)
Throne of Storms: Hall of Legends (x4) Challenge Mode

The Fortress of Drunder

Citadel of V'uul (x2)

Sullon's Spire (x4)
Sullon's Spire (x4) Challenge Mode

Tallon's Stronghold (x4)
Tallon's Stronghold (x4) Challenge

Vallon's Tower (x4)
Vallon's Tower (x4) Challenge Mode

Skyshrine

• Note- Some mobs in the Skyshrine zones allow you to switch to challenge mode during the fight instead of having a completely difference instance.

Dracur Prime: Sevalak Awakened (x4)
Dracur Prime: Vyskudra the Ancient (x4)
Skyshrine: Betrayal in the Underdepths (x4)