Any Drykas with a Cyphrus Strider that allows them to be their rider is a full member of the clan. They get the Windmarks when a horse picks them, and throughout their lives as horses age and die, these mounts change.
Drykas PCs with other sorts of mounts are not considered full members of the horseclans - and are often ostracized or considered freaks. There's a reason. Let me repost a PM I sent recently explaining this to some new members.
Okay guys... I understand your questions.
Do you remember the movie Arthur? Where at the beginning/end there are running horses and the narrator is talking about how the spirits of great horses are actually the spirits of great people come back again? That was my inspiration for the striders, only with a twist. If someone in life was well entwined and versed in webbing and used it, their spirit gets tied up in the massive web that surrounds Cyphrus... and they can't really move on. Its a danger and a blessing in both regards. Anyhow, this means most of the wise men and women, the Ankals, and any sort of mages or highly gifted people are simply interwoven too much to leave. They get either reincarnated on the grasslands as Drykas due to that fact, or they can come back as striders. Striders are Semele and Zulrav's children, gifted to the drykas to help them. Semele has a very special affection in her heart for the Drykas and wanted them to have something to help them... and gave them the striders. They had good horses before the Valterrian, but they weren't exactly Striders prior to the Valterrian. But somehow living in the bowels of Semele's body (Shes the goddess of earth) and feeding off her bounty transformed the Drykas' horses into what they are. So... because they were so proficient at webbing, the striders of 'modern day' tap the web and the energy in the web as they move which is why they can 'stride' twice as fast as a normal horse on the plains because they use the energy of the web not their own energy. And of course the web ties them to their riders even further. If a Drykas say was never tied into the web by their ankal, then they woudln't bond so easily. Striders who bond to Drykas are often relatives passed beyond.
So say you had wife you lost... a brother... a mother... a lover... and you also lost a horse and rebonded... odds are you'd bond with someone who'd passed beyond and came back.. your horse could really literally be (depending on the timing etc) a dead relative.
Jen
Hope that clears things up.
Goss