This arise out of an Aurora Steel farming discussion with @Poddiadv,
Can you 3T farm with double Skadi without a Superscope, Combat Uniform swap, or Arash sacrifice?
It turns out, Yes! You can with the True Ether Mystic Code:
DSS Recipes

Typical DSS setup uses what I’ll call the [1005050] recipe. That is, it relies on starting with 100% NP and Skadi’s 50% NP Batteries on Wave 2 and 3, assuming DPS will refund 50% NP from each NP.

The True Ether DSS setup as described below uses the [50+50500] recipe, relying on DPS to refund 100% NP on wave 2.
Not needing a Superscope opens up DSS to much more players by allowing the use of 50% CE.
Why does this work?
Background: How NP Gain Works
The NP Gain formula can be found here
https://blogs.nrvnqsr.com/entry.php/3306HowmuchNPdoIgetincombat
For our purposes, we can simplify it to:
Hitcount * NP per Hit * Quick Up * NP Gain Up * Overkill * enemyServerMod = NP Refund
A base Lancelot NP with 100% Quick up from 2x Skadi and Mana Reversal Lv10 activated will refund 60% NP:
(3x 10) hitcount * 0.5% * 200% Quick Up * 200% NP Gain Up = 60% NP refunded
If half of the hits are overkill (that is, 5 of the 10 hits each enemy), then the Overkill modifier is 1.25 (1 + 50% * 5/10):
30 * 0.5% * 200% * 200% * 1.25 Overkill = 75% NP refunded
If this was against Rider enemies, then enemyServerMod = 1.1:
30 * 0.5% * 200% * 200% * 1.25 * 1.1 enemyServerMod = 82.5% NP refunded
EnemyServerMod
Class  Normal  Special 

Saber  1.0  1.2 
Archer  1.0  1.2 
Lancer  1.0  1.2 
Rider  1.1  N/A 
Caster  1.2  N/A 
Assassin  0.9  N/A 
Berserker  0.8  0.96 
Ruler  1.0  N/A 
Special monsters are
 xxx soldier
 pirate
 zombie
 pirate zombie
 skeleton
 dragon fang soldier
 ghost
For any given NP we have four variables to ticker with, two of them depend on the enemy lineup.
 Quick Up
 NP Gain Up
 enemyServerMod (enemy dependent)
 Overkill (enemy HP and DPS damage dependent)
Why True Ether?
True Ether is unique among Mystic Codes in that it alone can affect NP bar for two waves. Its third skill does two things:
 10% NP battery
 40% NP Gain up for one turn
NP Gain up affects the NP refund for the next wave, thus by using True Ether on wave 2, it helps NP shortfall for wave 2 AND 3.
For example: Lancelot can achieve 100% refund with True Ether against Rider enemies with 5 overhits:
(3x 10) * 0.5% * 200% * 240% * 1.25 * 1.1 = 99% NP refunded, which rounds up to 100%.
Which 50% CE to use?
Unlike Kaleiscope, we have an embarrassment of riches to choose from:
Quick Up and NP Gain Up CE reduces the number of overkill hits required.
 Knights of Marines MLB  15% Quick UP
 Knights of Marines  10% Quick UP
 One Summer MLB  10% Quick UP, 10% NP Damage UP
 Magical Girl of Sapphire MLB  30% NP Gain UP
 Little Halloween Devil MLB  25% NP Gain UP
 Little Halloween Devil  20% NP Gain UP
Attack and damage boost CEs can also help by help the DPS get enough overkill hits. Plenty of CEs with ATK Up or NP Damage Up to choose from, but a darkhorse pick might be Fondant’s 30% Special Atk against Divine.
Overkill Requirements
Overkill requirements can be calculated by looking at NP Refund formula and plug in the other variables:
Hitcount * NP per Hit * Quick Up * NP Gain Up * Overkill * enemyServerMod = NP Refund
For Lancelot with nonQuick Up or NP Gain Up CEs:
30 * 0.5% * 2 * 2.4 * Overkill * 1.1 > 99%
Overkill = 1.25, or at least 5 of 10 overhit each. Similar calculations can be made with other CE combinations.
What does 5 Overkill hits require, exactly?
Lancelot has a NP damage distribution of 3,5,3,7,8,10,12,14,16,22. This means Lancelot needs to be credited for Overkill on the 6th hit of his NP (3%+5%+3%+7%+8%+10%), or 36% of his total NP damage.:
For a 30k HP enemy, this would be:
30k / 36% = 83,333 damage.
This means when 5 Overkill hits are required. NP damage needs to be about 2.8x (83333/30000) of mob HP,
You can play with the numbers a bit with the Command Chain Calculator:
Summary of Overhit required based on equipped CEs against Rider enemies:
CE  Overhits Required  Np Damage / Mob HP 

Knights of Marines MLB  4 / 10  2x 
* Knights of Marines  4 / 10  2x 
* One Summer MLB  4 / 10  2x 
* Magical Girl of Sapphire MLB  3 / 10  1.6x 
* Little Halloween Devil MLB  3 / 10  1.6x 
* Little Halloween Devil  3 / 10  1.6x 
* Damage CEs  5 / 10  2.8x 
Damage boosting
We basically have three classes of CEs available to us: 3, 4, 5 overhit requirement. Damage can be boosted in a variety of fashions
 Increasing Lancelot NP level
 CE damage bonuses: NP Damage UP, Quick Damage UP, ATK UP, Special ATK UP
 Increase CE ATK by leveling
 Increase Lancelot ATK by leveling, grail, attack fou, or gold attack fou
 Burning one or both Skadi’s skill 2 defense down
 Devil Boddhisiva’s NP Overcharge from Lancelot’s NP overcharge ATK UP
Since each overhit is worth 1% NP. Softening up the enemy mob by leading with facecard might also work, but this might not be a stable configuration.
Conclusion
DSS without Kaleiscope is possible if not trickier to pull off, but doing so opens up the possibility space: for Master without Superscope, and for masters to experiment more with alternate CE selection.
Overhit requirements against wave 2 Rider enemies:
CE  Overhits Required  Np Damage / Mob HP 

Knights of Marines MLB  4 / 10  2x 
* Knights of Marines  4 / 10  2x 
* One Summer MLB  4 / 10  2x 
* Magical Girl of Sapphire MLB  3 / 10  1.6x 
* Little Halloween Devil MLB  3 / 10  1.6x 
* Little Halloween Devil  3 / 10  1.6x 
* Damage CEs  5 / 10  2.8x 
ie Lancelot with One Summer can 100% refund against Triple Rider wave 2 if he does 2x enemy HP in damage. On the Ice Bridge node, this is possible with NP2 Lancelot.
Similar analysis against Caster enemies:
CE  Overhits Required  Np Damage / Mob HP 

Knights of Marines MLB  2 / 10  1.3x 
* Knights of Marines  2 / 10  1.3x 
* One Summer MLB  2 / 10  1.3x 
* Magical Girl of Sapphire MLB  1 / 10  1x 
* Little Halloween Devil MLB  1 / 10  1x 
* Little Halloween Devil  1 / 10  1x 
* Damage CEs  3 / 10  1.6x 
Against Saber, Archer, Lancer, and Ruler enemies:
CE  Overhits Required  Np Damage / Mob HP 

Knights of Marines MLB  6 / 10  3.9x 
* Knights of Marines  7 / 10  5.6x 
* One Summer MLB  7 / 10  5.6x 
* Magical Girl of Sapphire MLB  5 / 10  2.8x 
* Little Halloween Devil MLB  5 / 10  2.8x 
* Little Halloween Devil  6 / 10  3.9x 
* Damage CEs  8 / 10  9x 