Halls of Ascension.

[(XBOX)xFieldMarshal]

I've been looking all day need these for Sedna, Do they only spawn in certain missions on Lua? what is the best mission to find these?. 

[ChuckMaverick]

I generally do them on exterminate, as you can clear out all the mobs then go back and do the tests without interruption.

They spawn randomly.

[_Iye]

28 minutes ago, (Xbox One)Kode Egret said:

I've been looking all day need these for Sedna, Do they only spawn in certain missions on Lua? what is the best mission to find these?. 

Go to lua, usually spawn in the crossfire exterminate mission but can also be found in other missions as well. Halls of ascension represents 7 halls containing 7 drift mods hidden/protected with 7 individual parkour challenges. You may find 3 challenges at most in a single mission and again none in several attempts. Good Luck.

Edited December 7, 2016 by AhmadIvu

[Civic42]

Do MD and you get 1 test each time BUT sentient spawns at the first objective.

1 hour ago, (Xbox One)Kode Egret said:

I've been looking all day need these for Sedna, Do they only spawn in certain missions on Lua? what is the best mission to find these?. 

 

[Duavey]

I ran Exterminates to clear out enemies so I could run tests undisturbed, or Capture for a fast sweep through the tileset. Note that some of these tests require/are easier with a squad. I also hear the Speed test may be bugged, though I've never found it.

[Misgenesis]

Look for big blue hanging banners with a symbol on them. They usually indicate theres a test around.