Cosmo can be found in the green zone, I've had the best luck near the fertile lake. Creature finder mods help, as these things are tiny. To tame, approach it with chitin in your inventory. Wait until it starts to glow, then passively feed it chitin or plant species z seeds. (Z seeds are the best). Once tamed, you can put it on your shoulder and turn it into an item. To swing, equip cosmo item and enjoy. Webs recharge automatically, and from my experience capacity can not be leveled but can increase the higher level the tame. (Level 25 was about 20 capacity, and level 100 was about 40)

Before you try to tame it get a bunch of chitin, and put it in your last slot. The first feed will be easy (with the exception of the fire cats). Next you must approach it after it runs, but only if the light isn't red. If the light is red and you move then it'll web you and lose taming progress. It's basically just red light green light.

How to tame: PASSIVE

1. As far as i know rn, it only eats chitin!

2. Find one and wait for him to do a little dancey dance (will also glow white)

3. Feed him, and he will then start running and hopping around

3. This is when it turns into red light green light, follow him and once he glows red STOP, you can look around, but don’t move, once he begins to glow white then sprint for him

4. When you get close enough and he is glowing white you can feed him again

5 Repeat until tamed :)

Notes: He will run every time you feed him, and if you don’t stop on time when he turns red he just runs again, and you just wait for him to glow white, also if you get close enough to him but he switches to red, just wait for him to go back white (you can only feed him and move around when he’s white), the tame bar also doesn’t drop very fast, you would need to mess up a lot for it to drop lol, hopefully this all makes sense!

To tame cosmo:

It is a passive time with Chitan. A light pet is required.

Then, it is basic red light green light. He will flash a white/green light, you then sprint to him and feed him. He also can flash a red light, DONT move, as he will simply toss webs at you. Once he switches back to green/white, run back to feed him

Repeat until tamed. Also, note that once tamed, the web shooting ability appears as an item in your inventory.

You need a lightpet and chitin in the last hotbar. Once you find one, clap emote to turn your light pet on, then it will do a little dance animation. Feed it chitin and it will run away. Dont chase it yet. Youll see a red light. When it goes green, run to it. Usually about 5 seconds. Dont move while its red or it will web blast you. Feed chitin, repeat. Pretty easy tame actually.