I made this for The Nightbringer from Warhammer 40k, but it could be used for any Death God or sufficiently authoritative figure amongst the Undead that despises life.
Voice lines taken from Doctor Who's villain Sutekh, voiced by Gabriel Woolf,
helpfully isolated by Obscure Content on YouTube and edited by myself.
Tested and works in-game.
The base soundset I use to replace with this one is that of the
Centaur Archer. But of course, you are free to use these sounds to replace whatever you like.
Note that death sounds are attached to models, rather than being determined by chosen soundsets- so for example, in my test map for this I used a Lich, and for it to play the Death God death sound I replaced 'HeroLichDeath1.wav'. Even though it had the Centaur Archer soundset, it doesn't play the Centaur Archer death sound.
UPDATE: I have since done a revised version, which I've included alongside the original lines rather than just replacing them. This is because, while the new version is more intelligible, it has a bit of a metallic tinge which might not make it as suitable for fantasy maps.