Well...it depends. For a regular seraph, that would be things like making water unable to boil, sudden rock formations, lightning on a clear day, and other elemental things like that. When a seraph decides to grant a land their blessing and become a Lord of the Land, that can be as different as one seraph to another. It can be beneficial, like good health or academic achievement, but...not all blessings are good, and a seraph won't know if their blessing is bad until they become a Lord of the Land.

[Mikleo looks a little sad at that. He's met two seraphim like that already.]