Obern's athletic ability.
Frustratingly, it's not bad.
While his stamina isn't great, his long arms and legs move smoothly.
He has big hands and a good build.
When I once asked him, "Shouldn't someone who looks like you avoid sports on principle?" he said he never did sports.
Must be natural talent.
In other words, he's like an isekai T** C*****.
On top of that, when he uses acceleration and lightweight spells, he could put decent ninjas to shame.
This is why battle mages, combat wizards are scary.
A truly skilled mage can move as swiftly and powerfully as most knights.
Of course, they still couldn't beat a truly skilled knight.
Even Obern could scale walls to infiltrate buildings.
Plus, he had...
'Hey, there are two people coming behind that wall.'
Me, with my monster-like senses, attached to him.
'I sense magic from that door, suspicious!'