Based on my observations, I dicovered these things:
(Before the bug fix)
For example: An attacker has 70k Syntropy, his opponent has 10k Syntropy, they both have the same rit of Archers draining that Principle, whatever the outcome of the battle is, it will total their targeted Principle and will divide it to two, hence giving them both 40k VE. It doesn't matter who lose or wins, but you can say that the player with most Principle targeted will lose some or most of his Principle, of course, the Principle gained is based on the player's ritual and initiative, I'm just not sure if defense affects the drain.
(Battle Log)
A's Heretic Archer does drainelementelor to random creature(s) of B and:
Applying temporary effects for B, slot 4 : , weaken (round:3 weaken: defence=-82 )
- Drain power: 8.2637% ( tried for 0.17% )
**- Permanently draining: 752.597 Element Principle (8354.663 left).**
**- Draining 75260 vitality from Elemental I creature DIES!**
To this I say, 8% of B's Element Principle was drained by the Archers of A that doesn't have or low Element Principle, 8% of it is 752.597 Element Principle. The VE damage is the drained Principle multiplied by 100 will give B 75,260 (75,597 rounded off to the nearest 10th's) Vitality damage, much like the Angiens but more strategic.
These are just based on my observation about the new test for the Archers, I haven't tried it yet after the percentage was fixed.