What you have here is a definite need for Clarke's law.
(If you don't know who Clarke is... shame on you... http://www.phatnav.com/wiki/wiki.phtml?title=Arthur_C._Clarke
"Any sufficiently advanced technology is indistinguishable from magic from the view point of a technologically less sophisticated viewer."
Imagine, if you were from the 1930s, and saw someone wave their hand (that happened to have their car keys in it) and their car door unlocked and even opened. Magic right? While they wouldn't say it, people in the 40s, 50s, 60s, and 70s, (heck even certain parts of the world in the 80s) would think its magic. You have now seen Clarke's law in illustration.
Think of how enemy combatants in the Middle East respond to the US troops that seem to move effortlessly through the night and dark, can seemingly shoot around corners or across the horizon, and explosions appear at their command. Unfortunately this plays up the Minion of the Great Satan angle, but Night Vision Goggles, laser target painting, and computer controlled guns, stealth fighters/bomber air support, can seem like magic if you do not know about them. Another more topical example of clarke's law.
The Cargo Cults of the South Pacific and the Amazon Sky cults are perhaps the most classic examples of Clarke's law. There is enough of a technological gap that these peoples had no frame of reference to even comprehend how these things occured, even when explained to them.
This last example is the most important. The gap between the two group's technologies was so great, they did not even have a strong common frame of reference to communicate ideas.
If Erebus is talking about technology far in advanced of our own, it would be like the "zap" technology of certain science fiction works. Even we might not be able to comprehend it, from our lofty view -the 21st century. So it is much magic.
Now imagine a world where magic is an everyday occurance, not a mental crutch to deal with the world you don't understand. All advanced technology would be is a set of magic items that are not effected by dispells and counter magics. You are not going to get much effect from these items, because the characters will explain them away by using odd magic and the Players will go..."oh tech".
It is going to be very, very hard to get much dread and awe from the use of hypertechnology in the campaign. It, itself, will not do it. What it can be used for... that might scare the players. (and make sure all description is effects based, rather than using short cut words like cars, use enclosed cart with demonic laterns, that vibrates for no reason you can see. )
Gibson once said, "The best Science Fiction is on CNN". Things people would never dream of years before (super molds in aging space stations, computers causing brain damage (seizures), and cloning) are now everyday things on CNN. Good science fiction takes the science and social issues of the day and expands them to their semi-logical conclusions.
(If you don't know who Gibson is... sigh... cultural illiterates ... He defined a literary genre... http://www.antonraubenweiss.com/gibson/
To find technology that would be useful for you... scary and alien, take modern technology, and think about the people in the 1950 or 30s would think about this tech. Push it a bit to make science fictiony, and you have your hyper tech.
For example: people in the 50s would not understand the value of instant casual communiation across the world and real time sharing of info (and the results in expanded productivity). We take Computers, IM, and an interconnected society for granted. Expand it to lets say a mental connection... where you now have to know how to mentally tune into the stream of information you want...if not you are hearing the thoughts of EVERYONE on their little net (and the Aleph and memories of those gone). The system auto logs anyone in a certain area onto their mental net. The poor players would think it is an attack of some kind, as they would be losing their ability to think and focus. Those with low INTs or Egos/ wills might even become "devices" on the net. Entities on the net, might check out the new device to see what it can do. The Utility might or might not work perfectly, so the person might crash and have to be reset (sleep). Evil? Perhaps. But all it is, is an analogy of a wireless network. (Telepathic bluetooth.. cool).