Lyndon's Marksmanship: For every 5 enemy minion or mercenary kills near Lyndon, all followers gain 1 Basic Attack Damage. Hero Takedowns count as 2 minion kills
Kormac's Healing: Heals the target when playing as Kormac
Eirena's Magic: Basic Attacks from Eirena against Structures destroy 1 ammo and deal an additional 10% damage
Followers Inspiration: Each Follower gains 1 Health per second. This bonus is increased 0.5 to all Followers when a Regeneration Globe is picked up.
Minion Killer
Envenom
[Combat Trait] Persistence: Increases the resting time to 7 seconds
[Combat Trait] Repose: Adds a shield while in resting time
Battle Momentum (includes the shifting abilities)
[Q] Kormac's Loyalty: Taunted enemies also heal Kormac
[W] Eirena's Protection: Reflect missiles also blocks melee attacks
[E] Lyndon's Tricks: Movement speed increased after casting Vanish
[R] Asheara's Calling
[R] Maxed Out
Sprint
Shrink Ray
Enhanced Traits: (Active) Kormac receives increased health, Eirena receives increased Mana, Lyndon receives increased attack Damage for 5 seconds.
Fast Response: Switching into a different Follower takes 1 second and has reduced cooldown
Stoneskin
[Combat Trait] Main Class: Being 60 seconds without switching grants you +50% damage reduction. Bonus is cancelled upon switching.
Follower's Trust: Whenever shifting to a different follower you heal by 25% of the Follower's maximum health
Follower's Synergy: Allies passively receive increased Attack Damage when near a follower (Same as Tyrande's Trueshot Aura)
[R] Asheara's Training: Asheara's calling effect increased by 5 seconds, also grants a 10% increased attack damage to each of the followers
[R] Legendary Followers: The cooldown of the Followers Heroic skills is no longer shared
Follower Inspiration: Receive 5% increased attack speed for every allied hero within X range
Fury of the Storm

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The amount of ultimates available is simply too much and don't stand out as particularly useful, but instead just too complicated. So instead of having so many potential ultimates, why don't you simply have two? 'Asheara's Calling' is great, but what if a second one was a passive effect (not often done, but hear me out) let's just call it 'Town Portal'. What if this passive ultimate reduced the switch out cooldown by 12 seconds (making it only 8 seconds) and when you do swap characters you are awarded by the following benefits:
Switching to Kormac heals you for 15% of your base health over 6 seconds.
Switching to Eirena creates a damage shield on yourself for 20% of your base health and knocks targets back X-amount of yards.
Switching to Lyndon increases basic attack speed by 20% for 5 seconds.
The other issue is I fear only one of the three look at all possible to deal damage and that is Lyndon, even defensive or support based characters have some way to deal damage other than basic attacks. To fix this change Kormac's 'Intervene' to deal a frontal arc of damage instead of a taunt to mercs and minions (something not needed past level 10), that causes perhaps a small basic ability shield to counteract the lack of increased HP or armour for playing Kormac over the squishier Eirena and Lyndon.
As for Eirena, simply allow 'Erosion' to not only increase damage of those affected by the ability, but also deal a small to moderate tick of damage to those standing in the puddle (think T***ader). To make her different in her basic attacks, allow hers to be a steady beam that ticks damage (Lvl 16 talent idea: reduce this basic damage beam by half, but the affected target is vulnerable), if anything to have a different feel to the repeatedly fired projectiles/arrows from Lyndon.
Overall, this is a great concept and as said before, I myself, would love to play. The only other comment I can think to make is keep a careful eye on the generic talents you have there like stoneskin, envenom, fury of the storm etc as with using 1,2 and 3 to deal with the special aspects of this character you may not have space for these abilities in the talent bar or at least they are too far away from easy activation/use in fast paced team fights. Either way, good work. :)