There is a large amount of things for solo players. But the majority of bosses need a grp to kill. There are alot of subs around the server that are very good to make gold and possibly obtain kit from.
There is a system that the gm added which the mass drop, this has a chance to happen on every mob,sub and boss on server. What it does is when u kill the mob it has a chance to drop a lot better. For example if u got a mass drop on a mob u have a higher chance to get a item added that drops from the mobs anyway and u get a fairly large amount of gold.
If u got a mass drop on a sub it would the same size drop as if u had killed a boss but it cant drop the legendary tier items that are obtained from the bosses.
If you got a mass drop on a boss it would double sometimes triple the size of the normal boss drop and has a much large chance to obtain the items that are in its drop file.