So, Corvus and Ghost, both have 0% base crit chance, however, both have a mechanic that grants them an ability to 100% crit in their attacks, it has an priority over every other crit prevent mechanic in the game, not anymore, after today's update to V 23.1, their mechanics to guarantee crit in some of their attacks is being reduced by other nodes/champions abilities like for example, Antman's glance, Cap Infinity War glance and other critical resistence like sentinel's/red skull.
Video:
https://www.youtube.com/watch?v=vS9OUEIGxhg&feature=youtu.be