Unless in rage mode. This happen to everybody?
You know those skeleton that are ONLY vulnerable to melee, so that pretty much makes them invulnerable against Krieg (a melee character) if rage is cooling down.
And the disappearing skeleton mages definitely tied most annoying enemy in game (with fly bots), when they appear have to pull out rocket launcher and waste a ton of rockets nothing else can do.
Theyāre still pretty resilient - so I donāt really try to melee them outside of RtB (much less BXR) without a roid shield and/or Rapier.
Kriegās added melee damage (without any skills specād) puts his damage at almost double any other character at level 72, but thatās still not very much.
Iāve definitely heard that around here somewhere before. I never noticed with my BloodMania Krieg, I usually dispensed slag and high explosives until I was in RtB territory, at which point I swung at everything in range and chucked explosive axes at everything further away than that. Also, I am a fan of chucking Rolling Thunders blind through doorways and following them after theyāve stopped exploding. If you get some slag on the field first (I use a slag bouncing betty and then swap to the Rolling Thunder) that can eliminate almost a whole room of those nuisances. Also, Slagga+Fastball= Almost instafrag.
Nah thereās gotta be a bug somewhere, my Legendary Soldier Axton was doing decent damage on them with simple tomahawk smash.
Iām playing on xb1 btw
What level?
My Krieg is lvl 61. Very strong I think, but magic Slaughter round 1 was surprisingly tough with him. Coz heās so huge I was setting off those spikes all time, an unpleasant surprise lol.
I canāt really see how he can be doing less than Axton. Krieg gets an additional melee bonus that increases (as a percentage) as his level goes up. No idea 
Game bug dude? As awesome as this game is I do believe there are 1 or 2?
Some are good (like that one where you donāt have to reload or whatever), some like this I guess are not
Iāve only got as far as completing Hatredās shadow with my UVHM Krieg. Had a couple of crystal skeletons along the way, but I either had rampage ready to go or I was rocking a Slippery Ogre. Iāll keep any eye out through Lair and see what happens. Incidentally, were you running with a bladed weapon at all? Because from what Iāve read that apparently doesnāt do as much melee damage with Zer0.
Heās right at the threshold (level 61) - so it wonāt make any measurable difference.
Maybe a Love Thumper would smooth it out a bit? Start with a slag mari-nade, add a little roid damage, and a smidge of explosive nova to cover the bases? Garnish with a Flesh Crunch and an explosive relic just to make it pop? Not that this answers any questions, but as a viable alternate strategy in the absence of a solution?
Crystal Skeletons have as much health as Badass Skeletons and have an extremely strong resistance to all damage but suffer from a severe weakness to Explosive damage.
Donāt even bother trying to kill them with melee unless itās through Bloodsplosion or Buzz Axe Bombardier, as they take very little damage from anything thatās not Explosive (they can tank Incendiary Fastballs from Grenade Axton like itās nothing). Instead, get yourself a decent Explosive weapon and theyāll drop instantly. Iād recommend a Baby Maker, easy enough to farm and extremely effective overall on Krieg. But you can also go with a good old Unkempt Harold and theyāll go down just as fast.
Edit : actually theyāre also weak to melee.
? Pretty sure they were taking Torgue shotty blasts like they were nothing. These skeletons are weak to melee I remember when I beat the dome with Axton I kept a Law revolver in backpack and whenever I faced them they were destroyed in 3 or 4 slashes.
Yup just checked and youāre right : theyāre highly weak to melee as well. I was confusing them with Chupacabra Witch Doctors.
But then if as Axton with a Law you were able to easily dispatch them, why are you having issues with them as Krieg ? Krieg does way more melee damage than Axton, even with a Law.
I think Kriegās (and Gaigeās) melee attacks are bugged in quirky, unexpected ways? Iām not 100% sure on this but I seem to have read this somewhere and it seemed to be the case in my experience (they do less melee damage against crystalisks than the other characters, but once again, itās actually been awhile since Iāve gone around punching crystalisks (usually I just take them out from a distance) so Iām not 100% sure on this.) If theyāre bugged against crystalisks they could conceivably be bugged against crystal skeletons as well. If I get a little time later I might do some testing on this (or if anyone else does, feel free of course!)
And if you donāt have a Kerblaster or donāt want to farm for one, many fairly common ARs (Torgue Torpedo, Vladof Rocketeer, etc) with the Torgue barrel should work nicely too since that barrel causes the AR to fire pure-splash rounds that donāt reflect.