Board Thread:Questions and Answers/@comment-37066239-20181102071546/@comment-26447088-20181104195801

Honestly I would probably go Null instead of trying to build Water based off of having Bethlehem. Seeing as you have Ruprecht, who is a core unit for Null decks in any event. Bethlehem on the other hand is only decent for Fortress Frenzy. If you need damage for BotB, you could get Gilles de Rais (Remix) or Jeanne d'Arc (Golden Week) if your union doesn't already have them available as assist, since they boost damage by insane amounts. If you aren't running either of them right now, Gilles would be priority because her hit count alone from her Unique boosts damage by 131%, the largest team-wide boost in-game.

This way, you should be able to use Fire for BotB since Diarmuid helps with damage output.