since update i've noticed that poison zone from othell rogue is not working on raidboss, you can use it but cannot seen it anymore on raid boss debuff bar,never. please check. regards.
its future added with last update not a bug. and as was checked some time ago mental attacks land rate depends on many factors: base land rate skill level (which is = character level now) the disparity/difference between your level and the target level. (bad if you're lower, good if you're higher) m.atk vs. target m.def debuff attack bonus vs. target debuff resistance (i.e. epics, set bonuses) resistance buffs and debuffs (arcane protection, prophecy, arcane chaos, etc.) most of bosses resist even some feohs/aeore debuffs.
known is absolutely right. since the poisoned debuff from the poison zone skill is now mental, and all raid bosses have a full immunity to debuffs including mental (derangement), so there's almost no chance to land this debuff on a boss.
aren't mark of lumi and wynn's marks debuffs too ? coz they land very well on rb... even poison zone on blue light rb doesn't work.
funny how "poison" zone in not more poison but mental type... an other skill now can be added to useless-not-to-add-in-bar skill.