As far as I can tell, all NPCs that have an innate proc always ignore the spell data and single hit the target. Some examples:
Shiverbacks in fearlpane proc an AoE flagged spell that single hits the target.
Gorgalasks in airplane proc an AoE flagged stun that single hits the target.
Vex Thal bosses Thall Xundraux Diabo and Kaas Thox Xi Aten Ha Ra proc AoE spells that single hit the target only.
The test dummies in the arena proc heals (beneficial spells) that hit the target and not the caster.
Scarelings that proc a shadowstep hit the target and not the caster.
For TAKP I coded all innate NPC procs to ignore the spell data and always single hit the target for any spell. If anybody finds an example of an innate NPC proc hitting multiple targets or the NPC itself, I'd like to see it.
As for Zlandicar specifically, I 5 box killed him on Al'Kabor with pretty bad pre-elemental gear. I can verify that his stun proc was single only; at least there. I made a video of it and I believe uploaded it to nilbog already along with the other video I sent him. He's just not that hard.
Zlandicar's proc rate is about 23%. I have multi-hour logs of him on Live with thousands of hits to calculate that estimate from. It also matches my AK log. If his proc was hitting multiple targets, at 23% it would be very noticeable and mentioned. Stun Breath is casted by other dragons, which is why it is flagged as an AoE. Sony also has other ways to override the spell data, like adding resist modifiers specific to the NPC.
It's worth mentioning that innate NPC procs should also proc on rampage hits and kicks/bashes. (although Zlandicar doesn't kick or bash, but he does rampage)
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