You can get all 3 colored cards if you want. All you need to do is go to each of the crags, zone into (northern) Al'Taieu and kill the Aw'euvhi in each of the sections of (northern) Al'Taieu.
This "open" Aw'euvhi unlike the ones found in the Garden or the Palace, does not aggro you if you walk close to it. The NM ones in (northern) Al'Taieu don't seem that much harder than the ones in the Garden. They still die in about 5 Thunder 4 spells. They also sleep-able. So, a Blm (or a Rdm) can sleep/nuke kill it. The only thing it seems to give is the Key Item. You don't get xp from them.
The NM ones do seem to hit harder than the ones in the Garden. The NM ones seem to blow through a freshly casted SS in 1 hit. The ones in the Garden will take 2 or 3 hits to blow through SS.
This thing hits very hard. I tried meleeing it as a 75 rdm, but that was a really bad idea. It's sleepable though, and a nuke/sleep/nuke strategy worked.