Looking for pure mesmer support spec
Unfortunately, you’re asking for a build that really doesn’t exist in this game for any class. You want high uptime on boons, you want good healing, and you want nice damage. You get to pick 2 of those 3, but not all 3 at once.
The strongest pure support Mesmer build currently is the chaos maestro build, found here: https://forum-en.gw2archive.eu/forum/professions/mesmer/Guide-The-Chaos-Maestro-Boon-Support-Tank/
It has very high boon uptime and sharing combined with strong aoe healing capability. It does, however, lack strong damage.
In high level fotm, damage is an important aspect. If your team lacks the ability to output strong damage, you obviously need to abandon a support build in favor of a damage build. However, if you have plenty of damage and need more auxiliary support and buffing, this type of build is great.
Check out my Panacea mantra support build. Hope that helps
You can also check out the Hecate build which is mostly damage with a bit of mantra healing support, can always attempt to hybrid them.
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