Zombehs- I'll allow the horcrux like object under the following condition. Unlike a horcrux, if someone else gains possession of it, they have the power over his life, causing him pain or even killing him if they wish. This could also be used as a means of controlling him. If you don't want that condition, then you can make it a phylactery, which is a small container that holds his life force, but grants no power to anyone who holds it beyond the fact that if it is destroyed, so is your character.

Black Wizards- I agree about the clash of personality, but whether they've met before should be decided between you and Harine.

 Renny- Silas needs some work. I can't accept the character quite yet, as he is a bit overpowered as he stands. I like the idea of an air mage who is also a warrior, especially the lance. However, there is no basis for your character to be so old and have eternal youth. Your character should be a reasonable number of years old and age normally. Also, his credentials don't quite fit with backstory. I think he should focus mainly on one weapon type and have a second as back up, but not a third. Right now you have lance, bow, and sword. I'll let you keep your lance, but it's enchantment is too powerful. Dumb that down a bit. I'll accept your character being a horseman, farmer, quick thinker, and even being educated. Once you've made the appropriate changes, let me know and I'll look it over again.