u/Raff_run

Build/talents at the end.

While artifacts help, this challenge relies heavily on your skill. With my build, I can go from finishing with 24s left like I did, to failing/finishing with few seconds left. I'm pretty sure I could finish with 30s left if I kept practicing.

Here are some tips for you:

• Optimize your time killing the first waves first, keep retrying till you finish it at 1:20 at most? That'll allow you to start the boss fight with as much time as possible and save you some frustration;
• Don't weave NAs with CAs, that resets the pyro mechanism. Focus on one or on the other in the first phase;
• While the boss is immune, "charge" the pyro mechanism with charged attacks, so that you can do a charge attack > skill at the start of the fight. This is important as it will give you the Pyro E buff in the first rotation;
• Hug the boss at all times since he reduces damage from afar. Make use of your free dash to do so when he charges through you;
• Absolutely do not get hit by the boss's Cryo attacks at any point in the fight. If you do, quickly get hit by an Anemo slash or reset since it heavily slows you down (this doesn't mean you can't be hit at all, not all hits inflict Cryo);
• Look for when the boss's katana shines in order to dodge. If you think you won't dodge in time, use your burst;
• (only noticed this now) Prefer using a generic 5* catalyst (Skyward atlas, Kagura's verity) if you have one, since you won't be able to activate the Widsith's passive effect;
• If there's only a bit of HP left on the boss at the end of the timer, check if you actually got the Pyro buff on all your Es. I totally missed the pyro buff at 1:00, so technically I could have done even more damage!
• Alternatively, check if you used your burst while the boss does the cryo explosion. As seen in the clip, the boss takes no damage during it for some reason >:(

Feel free to comment if this helps, or with your own tips, too!