The previous post was starting to lose steam so here is another one.
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As always, please be careful of spoilers. Use warnings and tags when needed.
Feel free to share anything you want, or ask any questions :D
Lucky rolls to you all.
To actually answer your question, since no one else did … yes, there is one additional melee character you can get in Act 3, but he’s not the easiest character to find. It’ll be a slog to get that far without a tank.
Since you have a druid, you could try using a combo of animal form and summons to tank for you. I’ve found elemental summons are pretty durable, but won’t do as much damage as a real tank.
Otherwise yes, you could respect a party member to tank.
Do you mean Wild Shape, when you say animal form?