On October 20 Valve introduced fourth part of "Big Update" in Dota Underlords. It includes two new heroes (Io and Faceless Void) and new "Jail" system.
Previous details of "Big Update" you can see here.
Jail
Even though Season One adds 12 new Heroes to the roster, we have decided not to remove any Beta Season Heroes. You might be asking yourself: "Won't this make it harder to Rank Up
Heroes?".
This is where the Jail comes in: Every 24 hours, a number of crimin Heroes are removed from the pool. This system will also make sure that when
creating the list of Heroes to ban, that all Alliances can still be completed.
Source: steamcommunity.com
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