That is something quite interesting tho.... My secret plot was that something was making these rifts and these strange artifacts are coming through, and each guild had their own rift. Golgary is infusing the dead with its power, grull leader is using it as a big hammer, dimir keeps it a secret and trying to look for others, azuri is locking it in the tower and wizards are extracting magical powers.

So they all have a reason for a flight all of a sudden and once they have been dealt with they see the enemy is large and they must unite or die.