DB/SAI: Rise Obsidion (3.3.5 Script update)

A video of this quest from 2009 came to light, which showed a few things

* One text is yell not say, updated
* Added 2 missing texts first text and an emote text
* Dorius will now despawn when Lathoric enters
* Added some cooldown to event so event cannot be spammed, wont work again for minimum 60 seconds once started
* Lathroic the Black wont spawn until just before Dorius despawns

Closes #12712