D&D 5E List of instant death spells in 5e

[the Jester]

Inflict wounds cast at high lvl would leave no mark right?

I guess it depends on your DM, but to me, inflict wounds actually inflicts wounds- in other words, it causes big cuts and bashes to appear on the victim. Very obvious.

 

[woodja]

Maybe a Banshee's Wail?

Wail (1/Day). The banshee releases a mournful wail, provided
that she isn't in sunlight. This wail has no effect on constructs
and undead. All other creatures within 30 feet of her that can
hear her must make a DC 13 Constitution saving throw. On
a failure, a creature drops to 0 hit points. On a success, a
creature takes 10 (3d6) psychic damage.

 

[Tainted Powers]

That just might be it! Thx!

 

[Reynard]

Another possibility is an intellect devourer assassin. Unless an autopsy is done there is no outward evidence of a brain eaten from the inside.

 

[LevelSix_SYSTEM]

A bag of oranges as a improvised weapon, duh jk

 

[The Glen]

I do miss death spell. No muss, no fuss, no messy cleanup. Just a whole bunch of dead mooks