Celtic Heroes

Since celtic has died a bit for me due to reasons I won't go into I was thinking about how fun Wizard101 was back in the day with all the dungeons and stuff like castles etc. After reading a few posts on this board of which I never bothered going into until now, It got me wondering, are there actually mmorpg games for mobile that offer stuff like Wizard101 had I.e dungeons, midnight sun pagoda/winterbane where you don't need a huge amount of players online to make it die meaning you're not forced into a clan you simply invite a few friends and kill something and you few reap the spoils yourselves.