should also mention for support you wouldn't get jaksho. typical full build would look like UD, Sun, Thorn, Visage, Boots. Personally, I like visage over any other MR item since when paired with revitalize it makes your Shield Bash 30%-45% stronger. Literally a tank item becomes a damage tool.

I never build mana items or use mana runes for Rell. For me personally, she only really has mana issues early game but afterwards you don't notice having no extra mana. This is why I say to use Grasp instead of Aftershock, with Grasp you can just sit in armored form and auto with bramble and bami doing damage.