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Ive seen lots of posts lessening the importance of rifts and invasions ("they get old fast", "they are always the same"....). Ive been in most of the betas and fact is only now im truly beginning to grasp how much of a dynamic feel they give to the world.
Its true, having an invasion where your questgiver is can be a pain in the ass, but everything in this game, from the reward system to public grouping is engineered to make you want to fight that invasion, so chances are you wont have to do it alone. Yesterday i tried to stave off with a group of strangers a large series of invasions in the middle of an event . We gave hell easily to them , feeling as gods of the mmo world and thinking "god this is easy mode" ...then out of the blue at least 40 of those invasions attack us at once, creaming us (we took down at least a third of them before croaking out). That felt as something i had never felt before in an mmo ..it felt epic. The only thing that the scene lacked was a troll smoking a cigar and saying something like "i love the smell of burnt human flesh in the morning... it smells like victory".
Invasions and events apart, only saga of ryzom has mob AI as advanced as rift has. Mobs attack each other...not only invading mobs but your regular run of the mill wolf will attack that golden maw miner if he gets too near (and he will...there are lots of those intermobs fights everywhere if you watch for it) Add to that the thrill of that abyssal clique spawning from a foothold with a location in mind and the plan of slaughtering anything along the way, guardian, defiant or AI controlled and you have a dynamic, imprevisible world in which to play.
And , as someone pointed out in this forums, the best thing about this system is not only what has been done with it, but what can be done. They are an efficient and fun way of adding new content and making it reachable to all the players.