I'm not really sure if I want to dive into this game hardcore, but nonetheless, I'm a clueless newbie to the game who's trying to figure out how to manage which 3rd tier Soul/Heroic Spirit to aim for (or what order) as well as EX Ability matters, assistance would be appreciated. OTL

To my understanding after looking around (but not quite absorbing everything), the most touted are Andromeda and Siegfried, with D'Artagnan as a followup for farming purposes/EX Abilities. Thing is, apparently Andromeda does best with Black Propaganda, which also needs one to have Mordred? So I'm not sure if I want to jump to Siegfried to save me the hassle, or just go get Andromeda and then pump the points for D'Art/Mordred. Also, if I go for Sieg what EX ability does she like?

If it helps any, the starting Kamihime and Amon aside I have Belphegor, Hermod, Nergal and Baphomet. Thanks in advance. ><

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Don't think I've heard of Andromeda + Black Propaganda. Andromeda can work pretty well with Sniper Shot from D'artagnan, if you don't already have B-frame atk/def debuffs provided by someone else. But what you want as ex skill will be dictated by the situation and what you have to work with.

As long as you don't have an SR/SSR healer outside of Nike, Cassiopeia/Andromeda shoot up in priority. Which right now effectively means 'if you don't have Sol or Brynhildr, seriously consider Cassiopeia/Andromeda'. Second and fifth event from now will be thunder, for that matter.