I don't know if story progression have an effect on these rares, but I found them without any difficulty after Darken Forest events
Prometheus - Once you go into Lavafender, turn right and walk through the door, if there is a wyvern or evil eye there, continue on and find Prometheus in the next map.
Dragon Rana - Once you go in, you must meet 3 Shellflies, and once you pass the castle door, have a look on your right, if there is a dragon, Dragon Rana will not be there. Walk along the river and Dragon Rana will jump out to you if it's there.
Search for the mobs you are looking for on the sites search box. It will bring you a page with all the info on how to spawn them (what monsters you look for when zoning in) as well as providing you with a detailed map and very specific coordinates on where the mob will be.
Very useful site for everything Lost Remnant related. --- E8500 @ 3.8ghz / 4GB Patriot Viper Series (2X2GB) @ 1066 / P5Q-E / 4870 512MB @790 - 1000 / 4X Seagate 500GB / Antec Quattro 850watts / Antec 900 / Vista 64
Bah sorry I'm half asleep and misread your OP so don't mind the link as you already use it ;)
I can't speak for Dragon Rana but Prometheus spawns at the start of the game (as soon as you can get to his area he has a chance of being up). I saw him spawned as I was doing the side quest that takes you right by his spawn. --- E8500 @ 3.8ghz / 4GB Patriot Viper Series (2X2GB) @ 1066 / P5Q-E / 4870 512MB @790 - 1000 / 4X Seagate 500GB / Antec Quattro 850watts / Antec 900 / Vista 64
thanks for all the answer, but i still can't find it, is my luck really suck?
Prometheus : I recall i have meet it (only meet not battle) when i'm doing The Fiery Revolt Sidequest, you know where the flame guardian is don't you, it's the same place with prometheus and activated the cut scene to flame guardian if you go to the shining floor, when i meet it i think "oh my gosh it's a rare monster!! oh wait, there's a shining floor, ah, maybe i go to shining floor, see whatever cut scene it bring, and then save, and then try my luck against the rare monster" but after the cutscene, i get thrown back automatically to the Royotia Castle, and since then, i never meet that rare monster again.. Is Prometheus gone forever from my game?
Dragon Rana : First meet 3 Shellflies --> Done, No Dragons--> Done, No Misericodes --> Done, Result --> Still can't find it, even after trying this a lot of times...
Nah no worries izuk, he will spawn again as long as you didn't kill him (maybe even if you had but its a moot point).
I had the same issue as you my first play through, saw him up and didn't know any better so I went into the portal instead. However when I went back to kill him later he did eventually spawn. --- E8500 @ 3.8ghz / 4GB Patriot Viper Series (2X2GB) @ 1066 / P5Q-E / 4870 512MB @790 - 1000 / 4X Seagate 500GB / Antec Quattro 850watts / Antec 900 / Vista 64