User blog comment:Daywombat/AP Yi mid/@comment-6061249-20130420135902/@comment-2094543-20130421174250

Banshee's Veil kinda plays Thornmail's role - it completely blocks a single alpha strike - though it's situational, as people like Soraka and Xerath can chip away an entire team's veils in one go, and people whom you'd target to get a cooldown reset have presumably lost their spell shield already.