How exactly does holy symbol work now (Post bb)

The 10% cap is still in plaver no matter how many people you have. You can never get more than 110% the base exp.

Here is something I wrote a while back to explain it. I have seen no evidence of this changing Post-BB.

HS works like this.

Holy Symbol grants a maximum bonus of 50% experience to all party members. However, the amount of bonus exp is capped at 10% of the base exp of the monster.

Example:
Gallopera - 2500 Exp. HS cap = 2750.

Solo priest kills the monster.
Priest gets 100% base. HS bonus kicks in (4125) but that is over the 10% cap (2750).
Priest gets 2750 Exp total.

Priest + 1 party member who is within 5 levels of the monster (we'll assume the players are equal level). Priest kills the gallo alone.
Gallopera - 2500 Exp
Priest gets 80% base + half the remaining (10%) for 90% total = 2250 Full HS bonus kicks in (3375), but will hit the 10% cap (cap is 2750).
Priest gets total of 2750 base + 10% party bonus (2 members) of 275 for a total of 3025.
Other member gets half the leechable Exp (10%) = 250. Full HS bonus kicks in (375) and is under the cap, so it stays full.
Other member gets 375 base exp + 10% party bonus of 37 for a total of 412.

Priest +4 leeching members (assume all the same level) and priest kills the monster alone.
Gallopera - 2500 Exp.
Priest gets 80% base + 1/5 of the leechable exp (4%) totaling 84% = 1890. Full HS bonus kicks in (2835) but is still over the 10% cap (2750).
Priest gets 2750 base exp + 25% party bonus (5% per member) of 687 for a total of 3437.
Each leeching member gets 4% (20% / 5 members) exp (100). Full HS bonus kicks in (150) and is under the cap (2750).
Leech members get 150 Exp + 25% party bonus of 37 Exp for a total of 187.


So, the best scenario is to kill a monster when you have HS and 6 people in your party. Anybody killing a monster solo will get the maximum experience.

Practical example - 2 equal archmages are killing Skeles.
Without HS, each will get 90% base experience for their own kills, 10% base for their buddy's kills. Each of those will garner a 10% party bonus.
With HS, each will get 110% base experience for their own kills and about 15%base for their buddy's kills. Each will garner 10% party bonus.

HS is a tremendous asset.