How near-immortal Sorcerers die

Immortality or near-immortality can make characters sound quite invincible. If they heal fast or never get sick, how can anyone ever kill them? They sound much too powerful and you know what? I don't like invincible characters or beings that are all powerful and no one can EVER kill them off. That just sounds too convenient to have characters like that. It's like flawless characters. That's my personal opinion :P So what do I do? I come up with a way for Sorcerers to die.

Portals of Elgana

There are two types of portals in Elgana; normal portals and rogue portals. Normal portals are often just referred to as "portals". But what are rogue portals? Here are some interesting facts about rogue portals through comparison with normal portals. Normal portals are created with precision and care, considering the safety of those who pass through it. You will always end up in the location desired. Normal portals are found at Portal Stations and the only affect they have on the environment is that cities where there are portals can experience time differently. A day may not always be 24 hours.