Elemental Ailments are inflicted on you instead of Linked targets
Enemies near your Linked targets have Fire, Cold and Lightning Exposure
(New) Links take twice as long to break
(New) Link Skills Link to 1 additional random target
(New) Linked targets share Endurance, Frenzy and Power Charges with you
(New) Your Movement Speed is equal to the highest Movement Speed among Linked Players
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How to allocate Link Mastery?
Allocate a Notable Passive Skill in this cluster, then this Mastery becomes available to allocate in the cluster.
Spend a passive skill point on the mastery, then choose a specific stat to gain.
Related Link Skills
PoE 3.16 does include significant nerfs to "aurabot" characters who stack auras for the benefit of their party members, these Link skills give them a viable more-active playstyle.