OP said BELOW trans. Unless you mean Classic Wanda... who wouldn't be anywhere at the top anyways.
I also agree with Binary. Rachel Grey also deserves a nod, even though despite all that power she's still quite inept in using it optimally. Also Hope, depending on who she's copying.
Originally it was literally "Above Surfer and below Odin." Surfer being the consensus top of High Herald and Odin being the representative Skyfather, which is the next tier. It's one of the more easily defined tiers on KMC. More colloquially, it often refers to "team-wreckers" but that is a much more subjective distinction.
I definitely wouldn't be among the consensus that says that SS is the top of High Heralds. I'd easily take Superman or Thor over him....Thor less so, but Superman for sure.
Superman has a vast strength advantage and durability advantage over both (i.e. surviving an explosion equal to 52 SUPERnovas, whereas Thor has been shown to be able to be killed by 1 NOVA). The SS is well known has having one of the worst glass jaws amongst high end heralds. (and don't get me wrong, I'm not saying he's not a high end herald). Superman's combat speed is also well beyond either character, and Superman has defenses against both magic and energy draining, despite the common misconception here, and many board. But this is not a debate for this thread, if you'd like me to explain my case more, you can make a different thread or PM me, as I don't want to derail this one.
There's plenty of people that consider Thor an equal or near-equal, myself among them. This isn't the thread for that though. And I only mentioned it to clarify the tiers. The tiers thread was closed, is not an official source for power levels, and hasn't been around for a couple years.
Jenny Quantum, Hope Summers or Scarlett Witch..
Susan Richards is also very powerful even though she doesn't often get enough credit. Her powers originate from Hyperspace, the home of the Celestials, and she once shattered Exitar's containment suit/armor.