Where many other speedsters that are aware of the Speed Force use it and exhibit their knowledge about it, Savitar managed to merge with it at one point and became so increasingly dangerous that fighting him became like fighting the wind, it was possible for a few people but not all that many. In fact he’s so tough that he could heal his own wounds and fight off the Flash at the same time as he made use of the Speed Force to do this. If you can imagine an army worth of deadly criminals that can move faster than many humans or heroes can even register then you might get the feeling of just how serious this guy was. Savitar is kind of a hard character to explain since it’s stated that he’s the first person to ever come in contact with the Speed Force and after taking the name of the god of motion he became something of a cult leader that formed his own group and found ways to grant them super speed as well. Or rather, he’s a Barry Allen from the future, one that merged with the Speed Force and thereby became as close to a god as is humanly possible.
This could however be due to the fact that he knows more about the Flash than just about anyone, and that’s largely because he IS Barry Allen.
One thing to know about Savitar is that he’s fast, he’s tough, and unlike some other opponents he’s every bit the match for the scarlet speedster. It would appear that Savitar has a couple of different origin stories, but we’ll still to the one that’s been introduced into the TV series for the time being.