TrinityCore/TrinityCore — pull request #7828 by Trista (2012-09-20 21:15:14+00:00)
Title: Core/Conditions: Add relation to creator 

* This is used in spells with effect summon where the summoned creature doesn't get a *summonedby* flag and so relation to owner is not working. This way the unit get relation to the master who created it.
* World case where I'm going to use this is summoning Oculus drakes
* Blizzard seems to handle such cases with special spells in dbc that are missing and sniff gives nothing for them. The number of spells is unknown, but existence of atleast 10 is seen. They are used usually as bonus effects to make the check however mechanic is unknown. Guessing it is good as adding this. Also I can't have any proof that is their real purpose, but if this thing is not added it creates bugs.
Example:
You can never limit to right drake to mount in case there are 2 summoned by different players of same kind.