There are 3 quests in Magincia at present.
Magincia was destroyed about a year or 2 ago due to its pride(apparantly), i wasnt there for this so cant tell you more. The whole city was demolished and rubble spawned all over.
Last year, there was an influx of these figures you see and the rebuilding of magincia supposobly begun. This was about the same time as the crimson dragons invaded the towns.
Now, there is a mage by the moongate, if you gather the threads for him(ill explain at the end) he will award you with various pieces of rubble, you can only do this once per char and is meant to help towards re-building mag.
Side note: the threads have also been confirmed that they will enhance the cloaks of corruption although we do not yet know how many or to what effect.
Threads:
There are 3 types of thread,
Threads of Life
Threads of Fate
Threads of Thought.
The 3different "ghosts" you see drop a thread.
To recieve these you kill the corrupted souls(melee seems to get the highest drop rate) be careful, when they die they open a "vortex" and draw all nearby souls to aid them
You need to use the skill Spirit speak by the Forsaken souls(i think there the yellow named ones that dont move), they will then be released and occasionaly drop a thread.
The ones that walk around but dont attack you need to use the necromancy spell Exorcism.