https://store.steampowered.com/app/349770/Dungeon_of_the_Endless__Deep_Freeze_Addon/
This comes as part of both the Dungeon of the Endless collection, as well as the Endless Legend Emperor Edition (and according to SteamDB, a few other collections), so some may wanna check the store page first to see if they don't already have it. :)
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(2019-06-03)
Deep Freeze Addon no longer available
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https://www.games2gether.com/profile/me/rewards
https://store.steampowered.com/app/349770/Dungeon_of_the_Endless__Deep_Freeze_Addon/
Time limited freebie - DLC only
Adds it to your linked steam account, does not give keys. It appears you can add these to your account even if you don't own the base game, so add it now while you can so you can have it available later.
(2019-05-28)
Also still available:
Endless Space Collection - Endless Space + Endless Space Disharmony
Endless Space 2 - Muck and Makers Free Update (DLC)
Endless Space 2 - ES2 Uthassum Rhamoezz Sophon Hero (DLC)
Endless Space 2 - ES2 Community Challenge Add-on (DLC)
(2019-06-03)
Deep Freeze Addon no longer available
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