Deacon is worth to take to 60.

He is essentially a legendary in disguise. 

Bang on, and likely the only one I'd take there to 60 for now. Thenasil is OK and Khatun loses some value due to Deac. 

 Heiress - worth at least a 5 star if you don't have a cleanser. She cleanses on her A2 and her passive is decent if you build her for damage. She's good for a newer player's Clan Boss team as well. Also needed for the Myth-Heir unkillable team (one of the easier teams to build). 

High Khatun - Decent if you need a turn meter control champion. 

Deacon Armstrong - Definitely 6*. You will use him everywhere.   

Deacon it is. Thanks everyone. 

Absent of more information, Deacon is the only one I'd be willing to suggest - but it's also quite possible you have champs that make him much less useful. For example if you were randomly sitting on Lyssandra, Deacon's value goes down considerably.

This is what I've got if it helps (fairly new to the game so not much);

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Okay, so yeah Deacon should be brought to 60. Your Dragon 20 team will likely be Kael, Ronda, Deacon, Klodd, and Demytha.

I notice you are leveling champs somewhat haphazardly. Fortunately you haven't gone too far off the deep end. For now I would not bring any more champs to 50. Focus on getting those above five to 60. Dont spend any more resources on Elhain, Warpriest, Jizoh, or Tallia, or on any other of your 4* or lower champs.

Thanks for the advice. Yeah, i'd start levelling a Champ & then something better would come along. Guess that happens alot in the early days.