The 1st HII introduced in S11 was hidden at the merge and had the same power as the Immunity necklace. It was not rehidden
The 2nd HII introduced in S12 was hidden at exile island and once found could be used after the votes were read and that one lasted 2 seasons. It was never played.
The current version Introduced in season 14 allowed an idol to be hidden on either Exile island or each tribe camp. The idol since season 19 has been at each camp.
If the idol is played it goes back into play. If there are multiple played at the same time only one goes back into play. to keep 1 at each camp. If one is played but one is still hidden then it does not go back into play. Idols expire after final 5.
#survivor
There were 8-10 idols played this season and 4 advantages that were all used by different people.
Now I will say that survivor needs to get back to final 2's and have seasons that have no themes, swaps, and only 2 tribes. Keep Hii''s and use the season 32 twist where 2 regular idols equal super idol.
No extra votes, no recruits (been doing well on that front) no puzzles.