It's a small world.
Level Restrictions
The servers do enforce level restrictions, so a host cannot summon co-op helpers or be invaded by enemy PvP players who are not close to the same level. However, if you are invading then the other player is considered the host, which means they would be higher level than the reverse.
The level restrictions are always based on the host, who is the person not in soul form. If you are within their range, they can summon you, or you can invade them. So, while a high level character might be able to summon you, the reverse might not be true.
An example of this is a 144 player can summon a 119, but a 119 player cannot summon anyone greater than 140. The exact formula is : Host Soul level +/- (Host Soul Level * .1) + 10. You then take that result and always round the answer down. You can use the Level Range tool to calculate this information.
Wow, don't you want Heavy Arrows ? He's the only one who sell them !
I have no powerful spells, or the stats to use them. I plan on using my dragon claymore +3, some light armour, and that new shield I got.
I accidentally missed the opportunity for pure white in world 5. I defeated the archdemon, got my body back, and immediately died. Now I can't get pure white until a new game.
Edit: Well, so much for theManeater's. What's the point of having two of them if the first is going to be dead before other one has arrived? I ended up using my Uchigatana +9 instead. It strikes much faster.
The point is that you may very well end up fighting 2 of them at once if your character isn't well suited for the fight. I certainly had to. (until I cheated)