[ Wrathion frowns, shivering as he tries to think. Gold string. White string. Why string at all? A connection? A tether? Why different colours? ]

I'm not certain of the purpose. A tether? A connection? Knowing the usage might help explain the difference.

[ Easier said than done, of course. Still, one thing is certain: ]

This creature must be our killer, however. An instrument of vengeance. If they persist in summoning it I presume their intended victim still lives.

[ Wrathion suspects he knows who that is. ]