Magic secrets suggestions for rise of tiamat?

[Commissar]

Hello,

Finally we got 10th level in rise of tiamat campaign, but I have no idea what spells to pick.
Despite of having an arcana cleric, I'm the main healer of the party. I have already picked aura of vitality, mass cure wounds, mass healing word and I rarely use bard's crowd control spells, because of the particularity of the campaign.
I want to choose 2 spells that can do the difference in a dragon fight. So far I have chosen circle of power for the breaths and I'm thinking about banishment on a friendly target to force a dragon to change target, when its current target is at very low hp (we have a barbarian and a fighter in the front line).
What would you suggest?

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[akr71]

Bigby's Hand or Hold Monster to try and grapple/hold the dragon in place.
Teleportation Circle or Tree Stride for a quick(ish) get-away.
Conjure Elemental for some help fighting the beast.

 

[FormerlyHemlock]

You don't need to spend a magical secret on it, but--don't forget to cast Death Ward on everybody you can afford before a dragon fight. Not​ having to panic when the wizard is down to 17 HP can be golden.