"Fortify is a support gem. It causes the linked melee skills to apply the Fortify buff on the user"
It is not the user (not the character) who gains the buff. At least in case of Ancestral Warchief (as active gem) and Fortify Support (as support gem).
The Warchief page mentions this: https://pathofexile.gamepedia.com/Ancestral_Warchief
Please state it clearly somewhere, that what is the mechanics in general. Who will gain endurance, frenzy, etc. charges and/or other benefits? The character or the totem? At least in the case of attacking totems.
—The preceding unsigned comment was added by Dndmpdju9kvo4fwpxn5 (talk • contribs) 04:37, 17 November 2019 (UTC)