User blog comment:AtheistUntoDeath/Davien, The Hellborn/@comment-24170465-20131205030536/@comment-13542258-20131205212944

While it is true that the Q ability root on this champion has the potential to be longer than most, it does have several limitations that I have placed to keep him balanced. For starters, the 3+ second root is only possible if the target has full stacks of sin eater, which is very unlikely to occur on more than one champion. Another thing to consider is that the roots of other champions have benefits that Bind Them! does not have. For a start, all other root abilities deal more damage than this one. Most root abilities can be cast at a greater range (like Zyra or Lux), can be used more precisely (Ryse) or can effect more targets (Lissandra or Varus).

The reason for the longer potential root of Bind Them! is that it is intended to supplement Scorch the Earth. Most of Scorch the Earths damage comes from enemies standing in the afflicted area and without some means of mobility impediment, most enemies would easily walk out of the relatively small area and escape most of the damage. I chose a root because a slow would not have been effective enough and entangles and suppression are too powerful for the purpose of this spell. As for snaring multiple champions, this was because it enabled Scorch the Earth to have the potential to be used effectively against multiple opponents. Ultimately, Bind them is used to bolster another ability, which is why it appears overpowered.