Sleep Bomb Second Tier has 3 choices, two of which are named Smoke and Long, but have the exact same effect, range and duration.
When enemy Summoners cast large ‘clouds’ of Arcane Weapon, like Yendor or in the Level 5 of the Arcane Tower (The Golem), when large amounts despawn (go ‘poof’) the locks up. You can hear click in the background, but nothing happens. You can close the game and continue but sometimes requires to restart the game a couple times to get it to come back up. It does however come back right after the despawn.
Do not know if these were addressed in the 1.26 patch which I saw was released last night.