Hollow Knight

The Grimm Troupe DLC content can be accessed by finding a breakable wall in Howling Cliffs and finding a deceased corpse, use Dream Nail on it and attack the lantern that appears. When you return to Dirtmouth, two red coloured tents will appear next to Sly's shop. Grimm is in the right tent and will give you Grimmchild and ask you to collect flames all across Hallownest. You acquire these flames by having Grimmchild in your Charm loadout and go to the spots that appear on the map. Defeating the enemies that are at these spots will fill a gauge on Grimmchild. Return to Grimm when you have them and he will have you do it again. Once done, return to him with Grimmchild and you will battle him.

Grimm is quite a tough boss if you're ill prepared. He has a lot of attacks which are all hard to dodge. He will start the battle with a bow; you have the option to attack him during this phase but if you do, he will get angry and start the battle with one of his nastier attacks, where he will puff up and start firing fireballs all over the boss room. If you do not attack him, then he will attack as normal but will still do this attack over the course of the fight. To dodge this attack, go to the left or right side of the room and jump over the lowest fireball. This attack will last some time, so be prepared to do it for a around 10-15 seconds and will use it multiple times if he was hit during his bow. He is invulnerable while in this state except from Spells. He will attack with a swipe and an uppercut before raining fireballs down at you. This can be dodged using a Mothwing Cloak/Shade Cloak and attacking just before he uppercuts. He opens his cloak and will fire three fire bats at you. If you get too close before his third fire bat, then he will teleport to the other side of the room and resume his attack, use Vengeful Spirit/Shade Soul to attack him after you've dodged the bats. He will teleport on the top of the room and dive at you and will dive at you again from the ground. Dodge his first dive with Mothwing Cloak/Shade Cloak and jump over his next dive and attack him as he passes. He will appear on the ground and spikes will emerge from the ground around him. Just like Hollow Knight, there are gaps around the spikes so aim yourself between them.

When you get too close to him before he launches an attack, he will skitter backwards and do it then. Try to stay medium range when doing attacks, as when he backs off, he changes attack patterns which makes it harder to predict. If you deal enough damage to him, he will split apart into several bat forms. You can use this time to attack him or heal up, it's your choice. The battle is long draw out but if you keep your attacks up and do your best to dodge his attacks, then you can prevail. He will reward you for your performance with a Charm notch and this trophy will be yours.