Paragon assets

Can I use the paragon assets to make a commercial game?
And if I can, can I modify them as I wish

Yep, you can.

You cannot, however, sell the assets seperate. They have to be part of a project. This goes for all the Marketplace assets.

For more information please look at under the Usage Rights section.

I know I can’t sell them just i want to make sure that i can use them freely in a commercial game

You can. However, only if the game has been created with Unreal Engine. You cannot use the assets in for example Unity. Also see Marketplace Guidelines - Unreal Engine and the EULA EULA - Unreal Engine

yeah i know i can use only with ue4