https://www.pcgamer.com/help-save-the-whales-with-the-new-humble-strategy-bundle/

Like the countless Humble Bundles that have come before it, the new Humble Strategy Bundle offers a selection of good games for just $1: In this case, Dungeon of the Endless, the Endless Space Collection, Planetary Annihilation: Titans, and Company of Heroes 2 – Whale and Dolphin Conservation Charity Pattern Pack. That last one requires Company of Heroes 2, but that's okay because it's a full-on charity gig anyway: "All of the associated Relic / Sega revenue will be donated to the Whale and Dolphin Conservation charity," as its Steam page states. 

Moving on, paying more than the average price will also unlock the Empire: Total War Collection, Endless Legend – Classic Collection and the Endless Legend – Tempest DLC, and 66 percent off of Total War: Warhammer, which drops the price to $20 until May 24.