The wiki is wrong, Thrall of Bones didn't have a -10 MR check until 2002. It's placebo effect, use whichever one works on the level of mob you are charming, with those two they both have the same cast time.
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Originally Posted by Lucy
2002-09-04 11:33 Changed Resistadj from 0 to -10
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Also, at least from an Enchanter perspective, if you are getting resists on charm it's because the mob is higher level than the charm works on. Sometimes charm will break almost instantly, but for me it always lands if the mob is charmable and in the proper level range. I assume necro is the same.
In case you don't know you can tell the level of a potential pet in most zones by their max hit, Mob Level x 4 - 60. A level 45 mob x 4 = 180 - 60 = 120, a 45 mob max hits for 120. This doesn't apply to Velious mobs but in HS it is accurate for every mob in the zone besides Drusella.