So pestilence in affects is 2 parts, one is the recast timer, the other is the regen portion.

When the regen portion, which lasts 6 hours, expires, there is no echo at all.

When the recast timer expires, it says "The benefits of pestilence leave you."

This seems buggy, also the effect is only 5 mana regen?

Timer drop-off will now have proper echo. Regen portion does not have echo.

As to the last comment, go eat dirt.