Ok, we are playing on Retail GF files and want to lvl our soul cry @ Trexes.
We read about the different mob types on RPG club and found the ID of the ones that arent lvling the soul cry and the ones that are lvling it 100% and renamned them.
However, until now we only found 1 Successosaurus (the Soul Cry lvlt) and we repeat to check the whole island, but it appeares that most of the time there is none.
So we started to kill Failosaurusses (Soul cry never lvlt and we killed ALOT) in hope that Successosaurusses respawn, but actually the one Successosaurus we got just spawned randomly when we killed the 30 mobs for the raid quest. There was no Trex killed before on the island!

My question basicly is: What is the repsawn behaviour of Trex and if they only respawn as u kill them: What is the rate for a Scuccessosaurus to spawn?

I'm sorry i don't know much about respawns. I haven't heard about succesauruses and failosauruses yet

lvling cry at t-rex is a pain in the ass...i suggest you do anakazel, its way more convenient.And it drops tts and saint spear

or Seed of infinity just kill brothers at the end of dungeon and that's it

SoI is worse than trex

But you can lvl up to 14 and its easy to bring it with you when you go there with CP

We figured it out!
When the ingame daytime changes the Trexes all respawn and there is ever 1 Trex that has a 100% lvling successrate.
We made 4 Cry lvl 10-12 in 2 days there. I cant think about an easier way.

can you pm me more info where is that 100% t-rex?