Flavor is your friend in fifth edition as a player. Just how you describe the appearance of what you do can define major aspects of your character. Playing a warlock who uses their fists to attack? Why not just cast Eldritch Blast and flavor it as you imbue your fists with arcane energy to attack? Heck you can make multiple attacks this way due to multiple beams. Someone is gonna say in the notes how would you punch an enemy 30 feet away as per the range of Eldritch Blast? Use your imagination! Maybe you launch energy spectres of your fists or perhaps the power of your strikes are so great that the aftershocks reach that far! Sure spells and stuff have set descriptions of their appearance but why let that stop you! I say make these things your own as you are in fact the person using them. Make Fireball one of the trademark spells a literal sun! That rather than exploding just temporarily envelops the radius of the spell!
