well threat generation worked differently previously but regardless i think the line of thinking is that debuffing a mob is considered by the mob to be a fairly threatening attack.
the problems with narandi lance is... many. first of all its piercing, which has a lower skill cap than slashing. as discussed previously, generally 2h weapons also have less white damage threat than comparable 1h weapons and less procs per minutes (2 procs per minute at 255 dex compared to 2 procs per minute for primary and 1 proc per minute for secondary). the ratio is ok, but unlike frostreaver it doesnt have the stun component to generate additional threat on each proc. its not that magic DoTs are inherently bad threat (in fact, the lance proc is a -100 fire check) but its bad for a few reasons.
general procs threat generation is DD + DOT + spell. the spell portion is capped at 400 and many of the effects (AC debuffs, slows, etc) will hit that cap. afaik, resisted procs generate full threat (i.e. the same amount as it would if it landed). so if frostreaver procs its getting 125 + 0 + 400 = 525, whether it gets resisted or not. on the other hand, when narandi lance procs it potentially getting 0 + 36*18 + 0 = 648... but that will only happen on a resist. since its a -100 fire check, it has a decent chance to land, and when it lands its only 36 threat per 6 seconds... and if you proc again, you get no benefit because the original DOT is still rolling and it doesnt stack.
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