How many people can I boon?
AoE is limited to 5.
You are using an AoE.
You count as one person.
5 – 1 = 4.
You can provide AoE boons to 4 other people.
Yey.
five people
character limit
Ok, I see. Is it the same for all the abilities like Elixir Toss etc?
Almost every buff you can think of, if you can use it on multiple people, is five.
There are a few which break this rule, such as Temporal Curtain, which places the buff on the ground for a few seconds, during which as many people can run across it to get the buff. This is presumably balanced by that the buff only lasts for a very short time in the world, the player and other players must make their own attempt to get to it and run across it in time, and that it does not refresh existing buffs.