Telekinesis.
[Congratulations! Mind Bottleneck has been broken!]
[Host has achieved initial level Mind Control!]
[Host has achieved intermediate level Mind Power!]
On seeing this detailed system notification, Sebastian went into deep thought as he tried to replicate the scene in his head where he was forced to make use of the inherited magic ability in the battle against the Leviathon.
Faced against the OP Atomic Breath attack of the Leviathon, Sebastian was pushed to the brink after trying all his normal methods to block it.
Having strictly instructed himself not to make use of his unique skills at the time as he wanted to test his normal limits, he could only try to be creative, and given the small-time frame, he could only think of his telekinesis ability.
When Sebastian first received this inherited magic ability from his system, seeing a familiar term like telekinesis, he was hyped by its prospects.