SureAI

Hi, while walking in horse to the quest after I got to the monastery, I've the ghost rider Lazael.With difficult and some potions, I killed him.When i was looting him I found armagedon with a very big damage.The problem is, I am level 18 using bastard long sword and steel armor and with that sword I am too strong.
The game is unbalanced with weapon.Thanks

So? You can always sell it. Armageddon has already been nerved a few weeks after the release of the German version of Nehrim.

Yeah i saved and killed him, not that hard once i swatted the armageddon out of his hands and took it for myself... still, i'm lvl 25 and i think its too strong for me too, and if it indeed is the strongest sword in the game, i do not want it now.. so.. a question, is the ghost rider part of some quest? available at a later portion in the game? or will i just have to remember him some 10 lvls from now and go kill him then?

No, he is not quest-related.

Are there multiple ghost riders?
because the one I found didn't have a horse and i heard you take his horse if you kill him?
As for the weapon,if you think your not ready for its awesomeness just stash it in the safe and secure box
If you think you think you still might be tempted maybe you can place it in the bank account box?

Sometimes the rider gets separated from his horse by enemies.

Does that mean the horse is close by?
Also does the count as yours (aka he teleports with you) or is it one time ride only?

It should be close by. I don't think it counts as the player's, however.

Thanks for the attention,btw his horse cause my game to have 1 FPS.

EVERY light effect in the Dark Forest causes the game to lag down if Distant Land is activated. The only known workaround as for now is to deactivate Distant Land (in the Options Menu, or using the console command "tll") while in the Dark Forest.