Event overview: Interlocking Competition Hymnoi Wisdom
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Interlocking Competition: Hymnoi Wisdom is accessible once 1-10 is cleared.
In I.C., players have to carefully think about their choice of Operators. The mode first requires clearing Training Base operations, after which the player must clear the Final Proving Ground. Once the Final Proving Ground is cleared once, the player will have to clear Post operations.
Post operations do not cost 
Sanity and can be cleared as many times as desired, but will ask the player to "garrison" the Operators after a clear. If the player agrees to garrison, all Operators used to clear this operation will be locked and can no longer be used in other Post operations or the Final Proving Ground.
Every Post operation successfully garrisoned will add a Hymnoi Hero/Hymnoi Warrior to the Final Proving Ground, up to two each for a total of four, as many as there are Post. Each enemy added will increase the Sanity cost of the Final Proving Ground by 5, but also the amount of rewards. It should be noted that garrisoning all four Strongholds is required to complete all milestone rewards and acquire the medal.
Training Base operations and the Final Proving Ground awards 1 
for every 5 
spent to run them, including the increment by garrisoning Posts. Therefore, it is not necessary to farm Competition Medals on the Final Proving Ground, unless if one wants some challenge.