New buddy changes aren’t counting as a lingering grenade, meaning only two or three fragments are actually working with the changes. Solar being the ember of resolv, and Arc being the spark of shock Voids echo of remanents should make child of the old gods last longer, same with arcs, spark of magnitude, with arc soul, and ionic sentry. Also my bad wasn't aware on how this works before making this so I posted it twice.
[quote]New buddy changes aren’t counting as a lingering grenade.[/quote]That's because they're not lingering grenades. Ember of resolve 100% works with helion, but here are the descriptions quoted directly from the game:
[quote]Your lingering Arc grenades (Lightning Grenade, Pulse Grenade, and Storm Grenade) have extended duration[/quote]
[quote]Your lingering grenade effects (Vortex Grenade, Void Wall, Void Spike, and Axion Bolt) have increased duration.[/quote]