The shield has 2k health per default, I believe the level 3 Helix gives 1k more (confirmation needed)
If the shield then has 3k health, at level 5 with rage activated and blissbeast skullplate, that is… 7731. And an additional 7474 health equals 15205 in total.
1k default, 2k through helix
derp
Didn’t realize we were talking about Boulder
DR does effect the shield I believe
Ah, then the helix screen is incorrect. It says “2k” per default. 
2k would make the shield absorb 5154 damage, which is still quite a lot.
Actually I was just looking at it. It says “up to” so while murky it could definetly mean with helix chosen. It’s just kind of bad wording is all