Invisible Rains.
That two seated dildo/rocket. I have it and I love it... (no homo).
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That one is very good, but you have to pay for it...
From the "obtainable" ones, you can refer to the Ashes of Al'ar, which drop from Kaelthas in Tempest Keep (2%), or wait until it's added for points again.
I have a blazing hippogryph when it comes to flying and the raven lord for land. Invincible looks good but not as good as a raven lord, even though it's just my opinion. Oh, I forgot to say that when I have to fly it's because I'm doing some pve stuff or quests, most of that time I'm wearing my PvE gear so a Blazing Hippogryph looks absolutely gorgeous as a DK, meanwhile invincible is kinda "meh".
I'm also a member of an endgame guild which farms LoD, so it isn't that hard for me to get one Invincible once the time comes, and it applies to anyone who is a member of an endgame guild. And if we compare both mounts, Invincible is way easier to get than Raven Lord.
I'm not paying for something that can't be seen and is free!