Tier 3, Graviton Vortex used on Undead delivers 36 damage. With the UV you'd hit it with an astounding 47 damage. In contrast, a Graviton Vortex does 215 damage to slimes with no UV in Tier 3.
On bombs, you can test such things by just using a Mad Bomber Set since it provides Very High Damage bonus to bombs, saving the cost of having to actually make a UV Undead Graviton Vortex.
The damage is minuscule.
Tier 3, Graviton Vortex used on Undead delivers 36 damage. With the UV you'd hit it with an astounding 47 damage. In contrast, a Graviton Vortex does 215 damage to slimes with no UV in Tier 3.
On bombs, you can test such things by just using a Mad Bomber Set since it provides Very High Damage bonus to bombs, saving the cost of having to actually make a UV Undead Graviton Vortex.