Well I guess it mustn't be true.
I phrased it wrong. When you're dealing with lvl51+ mobs (not all are) trying to break a room and you get a critical resist and 3+ mobs come at you all with HT's, necro is going to survive more often than a chanter (then you have yourself a tricky CR). Even in north and west with cha gear those crit resists are a thing, though obviously not as frequent. You can even send in a regular pet whilst fd to burn those HT's , something a chanter cant do. For sure in normal fighting situations chanter will fare better, but ime shit happens , you get stunned, spells get interrupted or resisted and before you know it you're dead. It's nice to have that measure of safety to fall back on. FYI necro mez has a recast timer so you cant do what youre suggesting. You'd be better off mezing the pet, other will already be rooted and likely dotted including necro HoT dot which will give you some breathing room, and after 2nd summons charm mezed with enslave. But tbh, its just easier to reset. Unless you're just super amazing as a chanter and/or use a ton of clickies you're going to die, and even if you're super amazing, you're still going to die, eventually!
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If you're looking to go exploring the dangerous places Bristlebaner, like I said, chanter is the way to go. Just bare in mind velious isnt all that great to chanters either. MR was upped on alot of mobs and mez/charm immune giants if you wanted to go deep into kael.