If the enemy team has seen your tunnel (so it is on their minimap and in their fog of war), and you ult to it while they have no vision of it, they see the purple rocks above the tunnel that signal you're going there. It doesn't make much sense considering they can only see it in the fog of war. Makes her ult unusable for ganking if they've seen your tunnel but haven't cleared it yet.
GanksLikeGast0n5 votesI feel that she has plenty of ganking pressure even with this. It is definitely something to play around, but it is the trade offs like that allow counter play and prevent her from being too oppressive.
King Reidrum1 votesThe issue is that they can see where you're ulting even if they have no vision of the area. That doesn't seem like a counterplay option, it seems like a bug.
GanksLikeGast0n2 votesExcept that teleport works the same way. If you teleport to a ward in a bush the beam pops up like a beacon and warns everyone. I believe this is intended to prevent excessive levels of snowballing.
King Reidrum1 votesThat's a fair argument, but if they wanted something like that, don't you think the tunnel would reveal itself (if unseen) when you ult it? The issue is that this removes all of the tactical bluffing from her ult. I main Sion, and I use his global sound as a way to apply gank pressure to multiple lanes at once, while only ganking one of them. It tells people to back off or they might be dunked.
Rek'Sai has the same thing with the global scream to tell that she's coming, but you don't know where from. But if you can see exactly where she's going, there's no point to the scream.