They appear about every 7-10 min. If you don't focus it, and leave the tower, you loose. However, focusing it, and leaving the tower, allows all the enemies to focus the tower. All in all, you loose the ability to do a full hour on a tower. Atleast for me. Really discouraging. Not happy with this newly added "feature". 

What do you guys think? Is Stars end a viable farm location for Disto's still? Or will you try somewhere else, like I am?

I wonder if this is another one of their "solutions" for the afk farming situation that led to the "continuous key input" restriction that messed up so many other things.

But don't worry, soon they will "improve" this by removing Star's End altogether. /s, of course, but look at what they have been doing to everything else...

time for the basilisk treatment