I have been playing ESO on xbox with friend for years we are both around 800cp and keep dueling a lot with usually equal results but recently he made MagCro hevay attack build with Oakensoul ring, Knight Slayer and Sergeant set with 35k HP and I am pretty hopeless against this, he is combining heavy attack with blastbones and dancing around stunning totem so closegap and burst is not working and ranged burst not working as well as I hit very often that totem or summoned skeleton. When trying some other strategy which is not immediate high burst attack I die due to Sergeant stacks. I tried many builds as below all with similar results, My first try was MagDen but I gave up on this as comparing deep fissure with blastbones is unfair, blastbones is like homing missile and with deep fissure I miss like 8 out of 10 attempts. the only thing I was able to do is Sorc pet build and just fighting for draw with shields.
Builds I tried.
Mag Sorcerer high elf: innate axiom + crafty alfiq + infernal guardian; war maiden + crafty alfiq + infernal guardian; veteshran destro staff + necropotance + icy conjurer; crafty alfiq + necropotance + maw of infernal
Mag Warden breton: fortified brass heavy + ancient dragonguard + pirate skeleton with bear ulti (37k spell resist, 2,5k spell damage); ancient dragonguard + war maiden + pirate skelleton + vamp stage 3 (25k spell resist) with vampire ulti
Stam warden orc: hunding rage + stuhn favor + selene all medium
Mag nightblade dark elf: rettlacage + ancient dragonguard + pirate skelleton all heavy with around 30k resist playing without cloak melee with concealed weapon
Mag nightblade khajit: new moon acolyte + innate axiom + selene all light, not playable at all in duels
Now I am leveling mag templar and magDK with some hopes but would appreciate any suggestion. When I go Cyro and BG I have average results with some of these builds, nothing bad, the same also in duels in general so dont think all of these builds are trash but not enough against that MagCro. So could you please give me some tips and advice what to build purely against this one bar heavy attack magcro. I prefer Mag characters and the classes I mentioned but will take anything working.