DesolateHarmony |
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Treesinger is an archetype of Druid from the Advanced Race Guide. It includes a section on Plant Companions which includes the Treant Sapling.
According to Archives of Nethys, which is usually good about this, Treesinger is a legal archetype for elves. It doesn't say specifically that the companion is legal, but the text of the archetype does.
This takes us to the Additional Resources, a mandatory document to use the Advanced Race Guide as a resource. Under the entry for the Advanced Race Guide, AR states:
Quote:
"Elves: all alternate racial traits, except darkvision; all racial subtypes except arctic and dusk elves, are legal for play; all favored class options, racial archetypes, elven special materials except wyroot, feats, magic items, and spells are legal for play."
So nothing has indicated they are not legal for play, and AR says they are.