Spirit Link Totem? I wouldn't be completely against the idea as a whole, but I feel like it's more of an AST thing (Collective Unconscious for example would probably fit as a name). Or maybe a SCH one. Either way, the flaw in the idea is that Spirit Link allows for an uncapped number of party members to have their HP percentages equalized, in a game where only a certain number of players can be hit by AOE heals. Effectively, it allows the team to turn a strong 'this affects 5 out of 20 players' HOT, into a weaker one that is affecting everyone in the ring. Here, we have non-limited AOE healing (well, there's a limit, but it's far beyond what the party of 8 allows for, like 32 or 36 something) so we don't need to worry as much. The only thing we'd get out of this would be like, effectively turning a hard hitting prey or Tankbuster into a stack marker. Which isn't terrible per se, but it's also not going to see 'wow that's cool' moments in lower content really. I think if anything, the idea of 'turns not-AOE into actually-AOE' is best used as a Eukrasia style toggle for saving hotbar space, perhaps. Reminiscent of using the right button on DPAD to change your cure spells from 'hits one' to 'hits whole party but is weaker'. So instead of having Cure, Cure2, Medica, Medica2, Regen, we could have Cure 2 (cure1 upgrades), Regen, and the 'make it AOE' button, which changes Cure 2 to Cure 3, and Regen into Medica 2 (with different names, probably). Something like that, but on a new healer probably
I'll support the 100 skill though, I want a silly hat. Oh wait, we can't have that either, because SE probably wouldn't remember to make it work with Hrothgar heads
edit: thinking about it a bit more, I'd say it fits way more with AST. Consider, P10S stomps (the ones that apply a bleed), have the link hit the party and both tanks (or just one), and split the bleed from like 18k per tick on each tank across the whole party, to make it like, 2.5k per tick. And then use one of AST's several 60s OGCDs (of which two are currently HOTs) to counteract that bleed