D&D 5E Arcane Trickster + Green-Flame Blade = Sneak Attack dealing fire damage?

[Kithas]

This is less about persuasion, but about if anyone has seen a paragraph clearly dealing with that issue. However, I'd take it as "based on the weapon damage", but that also implies if the weapon itself deals nonphysical damage - like a Sunblade dealing radiant damage only - the Sneak Attack's damage will become radiant as well.

Afaik there is no paragraph specifically dealing with this. My interpretation with sunblade type weapons is that it would me radiant damage. No piercing or slashing is happening so it wouldnt make sense to add that type of damage. Additionally with a flametongue i would personally rule for 1/2 and 1/2 or player's choice.

 

[zaratan]

http://www.sageadvice.eu/2015/09/09/sneak-attack-damage-type/

 

[the_move]

Thank you!