They made the game so you couldn't really solo. Some classes could do ok, but mostly it was so dangerous it wasn't worth it. The goal was to get a group of 6 and then you could go on adventures and do serious stuff. But that could take hours and sometimes you just want to do something by yourself so some of the classes who had the Fear spell could combine it with the Snare spell and it made the enemy run away but slowly. So you could keep up with it and use your weak pet and some poisons/disease/magic to eventually kill it. It was dangerous though because the spells only lasted about 10 seconds so you had to remember to use it again and again until it was dead or it could end up 1 shotting you. Also the Fear spell could last a random duration, even 0.1 seconds, so it was risky business and you had to always stay at maximum range. But the players figured out these tricks.
The main one was that they put the enemies in batches, sometimes just 1 so easy, but sometimes you would go in a big room and there would be 10 enemies with some hiding in tents and stuff. The only way you were supposed to be able to survive that, was with a strong group of 6 and one of them needed to be able to mesmerize stuff, but that was very risky/flaky. But people figured out if the group stands way back, and then one of the feign death classes gets the attention of all the enemies and leads them away, and then does feign death, the enemies will stop and return to their camps. But they decide themselves when to return, so some go back right away, and one might stay behind a few seconds more. If you are quick someone can tag it with an arrow or the feign guy stands up and punches it (or shuriken, throwing knives, etc.) and then takes it to the group to kill.
Necromancer was the best at soloing by far, it could do that Fear trick earlier but you could also do 'root-rot' which was to cast the grasping roots spell to hold the enemy in place. And then you run away and get maximum distance. Then if you try to blast it, the root will break and you are dead. But you can use damage over time spells like poison to chip away slowly. And then the second the root spell breaks (it was random), you have to quickly cast it again. Dangerous and took a lot of practice but if you got good you could use invisibility to get to some boss enemy, and then gank it like an assassin all by yourself, even though it was supposed to be for a group. They could also do tricks with the charm spell, and with levitate you could fight in some areas with platforms and if you get in trouble you just jump off and float down. It wasn't easy to play though because they lost health over time and had to keep lifetapping stuff to stay alive, so you had to focus on the game.
Basically, we could have much cooler games if people stopped flocking to the big names only.