o===-===-===-===-===-===-===-===-===-===-===-===-===-===-===-===-===-===-===o
o STR: Strong INT: Genius WIS: Wise o
o DEX: Lightning CON: Durable CHA: Influential o
o===-===-===-===-===-===-===-===-===-===-===-===-===-===-===-===-===-===-===o

>l

The Garnet Lounge
As with the room below, the walls here are covered with twinkling crystals of
amethyst. The floor, though, is quite something to behold. Millions of
tiny, polished garnets have been painstakingly set into the floor in amazingly
complex and beautiful patterns. Your feet never actually touch them,
though, as they, like the rest of the lodge, are magically protected from
wearing down or breaking. The room contains many divans, cushions, and
comfortable chairs, as this is a lounge. You see several groups of mages
deep in conversation, many of them of professions you would expect to kill
each other on the spot rather than sit together and talk.
Obvious exits: n e s w nw ne sw se
The mage is here, fighting YOU!
The mage is here, fighting YOU!
The mage is here, fighting YOU!
A mage is resting quietly here.
A mage is resting quietly here.
A mage is resting quietly here.

[HP 88] [ME 67] [PE 97] || The Garnet Lounge || 1 obsidian, 3 platinum, 5 gold, 6 silver, 7 copper
>dance
You can't concentrate enough to dance.
The mage dodges your attack.
The mage dodges your attack.
The mage dodges your attack.
The mage misses you.
You dodge the mage's attack.
You dodge the mage's attack.
Overall, the mage has quite a few wounds.

Relogging did not fix this.

Were you proned by tripping yourself at all? According to the new updates, you can no longer dance in that state. If not, it might be a bugged offshoot of one of the NPCs being prone.

Apparently, either the required concentration for dancing was increased unannounced, or there's a bug going on.

Prior to this (as in, this weekend) I was able to dance and fight up to half a dozen NPCs. I haven't had a problem with dancing while fighting more than two since level 5 or 6. What's the deal?

There were no purposeful changes to concentration, dancing or otherwise. Furthermore, the changes went in on Friday - there were no changes at all during the weekend. So I'd say it is likely that the problem is specific to the situation or your character has changed in some way.

Afaik, my character has not changed at all. I haven't lost any stat points, and I've been GM for a good long while. I also tested this on other types and groups of NPCs, and the same effect occured.