Soy nuevo y me a tocado después de mucha desesperación x que no salía nada, me gustaría leer que tan buena es o tan mala y si vale la pena gastar recursos en ella muchas gracias de antemano
[I am new and it touched me after a lot of despair because nothing came out, I would like to read how good it is or how bad it is and if it is worth spending resources on it thank you very much in advance]
Hello! This is an English speaking forum, please post in English so we know what you’re asking about 
I added an English translation in your post. I know it takes extra effort to do this, but please translate your posts so we can all talk in the same language
If you search on the forum for Tyrfina you should find people discussing it. However, Tyrfina has been buffed since its first release so maybe that will be a bit confusing. 🏆 Neo Monsters tier list (see first post) 🏆 has rankings of all the monsters. You can do a search “in topic” to see posts about the monster.
Tyrfina is rated above average for a mythic in the tier list. It’s a good monster for making a comeback. If the opponent is winning then Tyrfina comes and quickly gets a turn and can use the punish move to quickly kill an enemy or two. However, I think it’s a monster that is much better for people who already have lots of strong monsters. It’s a useful tool in a strong team, but doesn’t do enough by itself. There are many other mythics which are better for helping you build a strong team.
i really rate tyrfina very highly. she is often overlooked however her skillset is really good in both PvE and PvP.
her purifying mist is among the fastest in the game which can be a great way of protecting your team if used on the frontline.
Her punish move is extremely good and her ability to heal herself off hold ground often allows her to live long enough to pull it off.
after that she becomes a potent sweeper with bloodthirst. her attack stat is among the highest in the game if i recall correctly. this makes it possible to charge bloodthirst WITH bloodthirst on an injured or low star monster.
KD is correct in saying that she is strong for those with existing strong monsters as she is more likely to be targeted by opponents if u surround her with lesser threats.
Idk about others but i will take her instead of soral