Tablets:
1x freedom of faith (unique ritual tablet)
2x Ritual tablets with: Altars in Map allow rerolling Favours 3 additional times (try to get +1 modifier here)
1x Ritual tablet (get 2 modifiers here, cheap since it's not +3 rerolls)
Mandatory: T16 6 mod map for lvl 80 area (this is how you get good omens).
3 tablet modifiers you always want: (spread across the 3 tablets) - Feel free to get 2x as any mod, only #1 is mandatory.
1: Rerolling favours at ritual altars in map cost 20-30% reduced tribute - This one is mandatory, if you only use one than you want a 28-30% roll.
2: Monsters Sacrificed at Ritual Altars in Map grant 18-30% increased Tribute
3: Ritual Favours in Map have 35-70% increased chance to be Omens
4: Deferring Favours at Ritual Altars in Map costs 20-30% reduced Tribute
Jado: Partial translation and unforeseen threats - unexpected mission is also good.