Spells: Dictate works on any level

[Metallikus]

quotes from Loraen's link:

"Dictate (Up to Level 58) - *48 Seconds on the Soapbox remaining before the rotten tomatoes incoming*
Casting Time: 2.4 Seconds
Duration: 48 Seconds Fixed"

"Many Enchanters wonder about the why the fixed duration Dictate spell was even added. While the situations for its use are very limited, there are a few places this spell can be useful. The most noteworthy is Kael. The high level giants (55+) there are immune to all forms of Mez, but are still flagged as charmable. Dictate can be used in this situation as a 48 second crowd control spell. However, this spell outlived its usefulness back during Scars of Velious, and with the addition of the newer high level charms it has gone the way of the Dodo bird. Though, “Frozen Moses” and Sirran the Lunatic owned many a mob for the resourceful and daring back in the days of Velious. Ahhhh the memories of solo farming Shields' of the Void! But I digress, back to the guide. /wave Salidor"

"The Charm Line
In the high level zones, the PoP spell lineup (lvl 61+) given to chanters is extremely powerful for charm soloing. The key spells being Arcane Rune, Word of Morrell, and our new Charms. The selection in the lower level spells for charming are a little more limited, but still effective."

All his information is based on Planes of Power time line, not classic, so not sure about it being relevant here (except that sirran was supposedly charmable during velious).