Warding Halo functions as a damage reduction shield and it also damages and stuns nearby enemies when they're too close. It's base is around 2500-3000 points only. However there's a 3-second invincibility period where it absorbs damage and adds it to the Halo by 250%.
In a void defense mission, the target is surrounded by lasers you can activate. So, I tried activating one and casted Warding Halo in front of it, capturing its damage and converting it into shields. I was expecting around 10-15 thousands worth of shield but I was caught off guard with the 3 Million total that I got! That would mean the laser damages around 1-1.2 Million! Talk about OP! Warding halo isn't 100% damage reduction though, it's only 90%, so that means I would still die. Toxin attacks also deal damages directly to my HP, so that's another thing. Eitherway, getting its numbers as high as that was pretty awesome!
Thanks!