DECISIONS:
Major decisions with random descriptions:

Prestige for Gold:
Base cost with no modifiers: 350 Prestige
You get:
175 gold with no modifiers;
200 xp on martial and intrigue lifestyles;
5 dread with no modifiers.

Prestige for piety:
Base cost with no modifiers: 350 prestige
You get:
200 piety with no modifiers,
200xp on learning and diplomacy lifestyles.
same faith theocracy government opinion = 10
same faith opinion = 5

Piety for Gold:
Base cost with no modifiers: 350 piety
You get:
175 gold with no modifiers;
150xp on diplomatic and learning lifestyle;
100xp on stewardship lifestyle.

Piety for Prestige:
Base cost with no modifiers: 350
You get:
200 prestige with no modifiers;
400xp intrigue lifestyle;
5 dread with no modifiers.

Everything for Renown:
You will pay 500 of all the 3 main currencies and get:
500 renown;
250 diplomacy and stewardship lifestyle;
100xp intrigue lifestyle.

Decisions that may trigger character events:

Gold for prestige:
Base cost with no modifiers: 200 gold
You get:
direct vassal opinion = 15
courtier and guest opinion = 10
125 prestige with no modifiers;
150 stewardship lifestyle xp;
150 diplomacy lifestyle xp;
Spawn a random event chain: You can Help/Employ/Dismiss/kill a random character and gain rewards
(physicians, knights, spymasters, chancellors or random chars with hooks, If you help the character you will keep attracting more subjects.)

Gold for Piety:
Base cost with no modifiers: 200 gold
You get:
same faith theocracy government opinion = 25
125 piety with no modifiers;
150xp on diplomacy lifestyle;
150xp on stewardship lifestyle;
150xp on learnig lifestyle;
Spawn a random event chain: You can Help/Employ/Dismiss/kill a random character and gain rewards
( physicians, knights, spymasters, chancellors or random chars with hooks, If you help the character you will keep attracting more subjects.)

AI:

AI will not trigger character event chains.
AI will do all decisions passively, if they have spare currency to waste and lack the other one, but all depends on the weight of their traits.
A zealous character will 'donate to a small temple' but a greedy one will not, a zealous and greedy one is another story...
For now it's more or less focused more on personalities and not so much on strategy, good for roleplay but dont expect a ruler on a losing war to exchange currencies to hire mercs... AI will for sure do it, but its entirely random and not an actual AI goal. xD for now

NOTES:
All decisisons have cooldowns stress effects and some will take 8 to 90 days to be resolved.
Costs will change depending on your Rank
Rewards will increase depending on your Attributes and Rank