Steelshank KratzvatzFollow

Hey all, I wanted to hold off on posting a thread on this until we turned 99 and I could really experiment on it.

NM Steelshank Kratzvatz
http://wiki.bluegartr.com/bg/Steelshank_Kratzvatz

Dynamis Sandy
Drops: Oneiros Cappa
http://wiki.bluegartr.com/bg/Oneiros_Cappa

Ok so, back at 90 and 95 had tried to duo/trio/4man this BST style and failed pretty spectacularly.
Tried as a duo at 99, both BST above average pet pdt/mdt/evasion sets using Falcorr. Pulled to North Sandy zone. We subbed DNC and meleed along with pets, spamming Box Step. Whenever he summoned a Hecteye, we moved both pets and ourselves to the hecteye. Very important to look away from it if you have hate and to snarl quickly, getting paralyzed can wipe you.

We used this plan perfectly until 50% when he became massively stronger (crits were doing 550+). We held on until about 45% until I got hit with an unlucky Charmga, and we couldn't recover.
Even without the charmga we would have probably lost.
Anyone have any ideas with this NM?