From the unofficial tooltip translation thread on Reddit:
Depending on implementation, this can help get around certain mechanics such as all the tilting during Sophia.>> Surecast - While active, next spell is cast without interruption, and you are immune to sleep, stun, knockback, and pulls // 10s duration // 30s cooldown
Just wanted to point out this change (subject to change upon release) for any player looking to optimize their play. Also makes sense why Surecast is a level 48 ability now with those kinds of status protection.