yea, this wasn't meant to be a serious build. This is the build i use when i want to play around with Nasus and have fun. When I actually try hard to win games i do a DPS/tank hybrid. I would post that build but i dunno if i even need too. It's not that much different than any of the other nasus builds I've seen posted on this site. Might just look repetitive imo. Therefore i post fun builds.

yea, I was debating that actually. It was either Rod of ages or Rylai's but i chose the latter because in theory the slow from Rylai's should work with his ult. Been trying to see if it works but its hard to tell since i usually just wither people I'm chasing. Don't really want to trade RoA for the Soul Shroud cause the cooldown reduction is great for his Q strike and ult. Also gotta remember that you don't want to get his ap too high cause there is a damage cap, probably shouldn't aim for anything over 10%. That's part of the reason i get sunfire toward the end there, the other part being more survivability.

But yea, if it turns out Rylai's doesn't work with his ult then you right and it should certainly be traded for Rod of Ages. I suppose if you not concerned about doing Q strike damage and want to focus more on surviving you could also trade RoA for the Lich Bane, I'm sure there are a few other ways to try this.