HoD makes basically CD useless. Same casting time, same recast time, no level limit and no knockback. When you need the knockback just use the lower level version it works on mobs despite their immunity to the stun. CD is just one of those AA that are here to make our max AA count increase
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You don't really need a message, if it is resisted then you have a message saying your gater is going to play with you, if you don't see one of those red scary messages then you're fine (because there's no level limit).