Question for some opinions from you anons! What do you flavor Force damage like? We've got a few NPC Creatures that deal primarily force damage from its weapon strikes the examples...

Balor
>Lightning Blade. Melee Attack Roll: +14, reach 10 ft. Hit: 21 (3d8 + 8) Force damage plus 22 (4d10) Lightning damage, and the target can't take Reactions until the start of the balor's next turn.
&
>Flame Whip. Melee Attack Roll: +14, reach 30 ft. Hit: 18 (3d6 + 8) Force damage plus 17 (5d6) Fire damage. If the target is a Huge or smaller creature, the balor pulls the target up to 25 feet straight toward itself, and the target has the Prone condition.

Empyrean
>Sacred Weapon. Melee Attack Roll: +17, reach 10 ft. Hit: 31 (6d6 + 10) Force damage, and the target has the Stunned condition until the start of the empyrean's next turn. The target can choose not to be Stunned, in which case it takes an extra 21 Force damage that bypasses Resistance or Immunity.

Pit Fiend
>Fiery Mace. Melee Attack Roll: +14, reach 10 ft. Hit: 22 (4d6 + 8) Force damage plus 21 (6d6) Fire damage.

Ultroloth
>Mercurial Whip. Melee Attack Roll: +9, reach 15 ft. Hit: 25 (6d6 + 4) Force damage, and the ultroloth can teleport the target up to 10 feet to an unoccupied space the ultroloth can see that isn't in the air.

I might be boring, but I simply explain it as if its the normal damage but unresistable. Like An Empyrean's Sacred Weapon that looks like a Greatsword "cuts" like Slashing but would tear through anything it touched. Or the Pit Fiend here's mace would be capable of crushing anything it strikes.