What I've learned about High Mercury
About after an hour, not at all exhaustive but should keep a few peeps from instantly getting wiped out
Firstly, she does the big bang attack the kills anybody who's lacking the wyrmprint, and after that she has a ranged multi "fire ball" attack and a tailwhip that both hit hard and have huge range but can be I-framed with skills.
After fighting for a bit she'll do a move called "Spheres of Salvation" and 4 bubbles will appear in the back part of the arena:
These bubbles protect the team from her big water attack that has killed everyone who didn't make it in a bubble.
YOU CAN NOT SHARE A BUBBLE, AND THEY HAVE HEALTH BARS AND CAN BE BROKEN (when you get in one it'll get bigger as an indication, positioning is important)
Later in the fight she'll summon rats to attack your bubbles.
If you guys survive her big wave she'll pick a team member and trap them in a bubble and the rest of the team have to break them out or they'll take fatal damage.
At the same time or a little later she'll send out a homing bubble and this targets another player, it does a lot of damage and will explode after some time.
TURNING INTO A DRAGON WILL NOT KEEP YOU FROM GETTING CAUGHT IN THE BUBBLE.
Assuming more than one of you are still around, another thing you should know is that Mercury will summon a circle of bubbles around her, attacking them will break them into smaller bubbles that yield dragon charge but they'll move on impact and can damage you and your teammates.
Unfortunately this is all I've been able to figure out. Hopefully this helps!!!








