They removed that mechanic in the Lady Vashj fight in 4.2. Mionelol was able to solo Vashj, because you no longer get "Frozen" upon picking up a "corrupted core".
My rogue friend and I tried Duoing Vashj back in 4.0.6 and the core mechanic was the only thing stopping us from being successful =/
Also here's hoping they let you change your sets into "Dungeon Set 2" looks, IF YOU HAVE IT. The quest chain was removed in 4.0, so a very small handful of players actually have all 8/8, myself included
EDIT: I didn't realize "Dungeon Set 1" was removed from the game in 4.0 as well, due to some dungeons changing in level and them dropping different ilvl gear. Too bad Heirloom gear uses the same model as "Dungeon Set 1". :|
My rogue friend and I tried Duoing Vashj back in 4.0.6 and the core mechanic was the only thing stopping us from being successful =/
Also here's hoping they let you change your sets into "Dungeon Set 2" looks, IF YOU HAVE IT. The quest chain was removed in 4.0, so a very small handful of players actually have all 8/8, myself included
EDIT: I didn't realize "Dungeon Set 1" was removed from the game in 4.0 as well, due to some dungeons changing in level and them dropping different ilvl gear. Too bad Heirloom gear uses the same model as "Dungeon Set 1". :|