Use it without worry.
If you have your herald tank (like I did), you might pull threat from your herald a fraction sooner than if you use another weapon, but not noticeably.
If you are in a group, healers' and tanks' threat, or your own healing threat, will way outpace your halberd.
tl;dr: no worries
"Sometimes survival comes down to not being hit. Actually, most times." -the chicken skill, Bob and Weave
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