So how long was killy dead for? Like a few decades or so?

Longer than that, though I’m actually a little hesitant to pin it down to a very specific time- partially because the Destiny lore makes it really hard to make a timeline that says “x happened x many years ago and y happened y long ago” and it’s a little aggravating!

But we’ll say he’s been dead maybe 60-90 years about? Pharri is over 100 at this point, and Killy was maybe 30-40 when he died. (Which is pretty damn young considering their lifespans.) I’ll be going over this a bit in part 3, so that’s all I’ll say for right now. 😀