Bewitching Table

The buff sticks around after you pick the table back up, so the routine is place it, activate it, mine it, pocket it. One table lasts the rest of the playthrough and using it costs nothing. The only discipline required is remembering to set it down again after every death, because dying is what takes the buff away.

It does nothing for sentries. That job belongs to the War Table, and the two are worth standing next to each other in any arena you build. A summoner heading into an event should be tapping both before the first wave.

They generate naturally in the Dungeon, which means most players walk past several without realizing what they do. If your dungeon run is long behind you, the Witch Doctor will stock one in hardmode once the Wizard has moved into town. Fishing the dungeon can also turn one up.

It fills the table requirement for an NPC house and gives off light, so there is no reason to hide it in storage. Build it into a room you pass through and you will use it far more often than one sitting in a chest.