Great conversation, if a bit necro on it! I'm glad I found it as I have a bard in my current LU game. We have some questions.
As per Selganor's post, the bard starts a hymn on their turn. That costs no action. Then, the idea is that maybe before the end of the bard's turn, they give their party members something they can do, or the bard uses their reaction during the combat to activate a specific hymn. This allows them flexibility with the hymns they know. Is that correct?
The question I had is what is the duration for them? Just until the bard's next turn? Does this also mean that a bard could start a hymn, be doing a hymn the entire battle and if they decided never to actually target someone, they never use it, or a BI, up? Is it obvious when someone is being targeted by a hymn? I'm thinking about Overbearing Rhythmn with additional creatures based on CHA mod. Is this saying that all attacks against targeted creatures are at disadvantage? And as soon as the hymn is used, a BI is used which lasts for the round? However, then let's look at Call to Arms. I think the wording is such that the intention is that once it gives that bonus damage die, it uses up a BI. In theory, if the target of Call to Arms misses, it never costs a BI but it also means that the bard is sustaining the Call to Arms Hymn the entire time?
Hmm. Is this why it's better used as a reaction? The bard starts an undefined hymn and then waits to see if his team member hits first, so does Call to Arms to give extra damage or if the enemy attacks first, does Overbearing Rhythmn to give the enemy disadvantage? Is that the intention of them?
I talked to my player about this, and we did agree on several things. First, it is based on their type of performance, so anything that would stop that shuts this down. Second, we agreed that since as written target for Overbearing Rhythmn is the party member, once disadvantage happens once, the effect is over for that party member. However, third, we preferred Overbearing Rhythmn to target a group of enemies and they have disadvantage on their next d20 roll. If they are willing to do nothing, they can avoid negative effects.
We came up with this because if the bad guys use good tactics and all targeting the wizard, every attack being at disadvantage was OP to us.
My teeny, tiny issue with the description is that it's more gamist and I prefer narrativist. The idea for Overbearing Rhythmn is to make it so they are protected from attacks but it's the passive part. I prefer the bad guys targeted with the negative effect compared to some aura around a character given the effect. That's minor, though.
Thanks!