The Caiatl card is presumably tied to the ... "The Whisper" is the first Exotic mission that Destiny 2 ever received. You must descend to the heart of Io to carve out the Taken corruption within.

One of the biggest new features in Destiny 2's The Final Shape expansion is the ... These five stage quests have you fighting alongside Mithrax and Caiatl and will let you unlock the Ergo Sum ...