When offered eternal life, take it. No matter your mind's fate, come heat death, your body may be what sustains all that's left of life, maybe even some civilizations.
"maddening beating of vile drums" - heart, check.
"thin monotonous whine of accursed flutes" - breath, check.
"outside the ordered universe" - past heat death, check.
Conclusion: Live long enough and you get to be Azathoth.
֍ At the center of our cooling cosmos, our mad god lies in torpor. What our forebearers called 'the maddening beat of vile drums' is now our sun. May it never wake. ֎