Demytha joins the Dwarves as part of Patch 4.70 and is a bit of a gamechanger. Previously there were very few block damage options with only Roshcard the Tower and Warcaster mainly used. Demytha not only has a Block Damage ability on her A3 but she also will extend buffs on her A2 unlocking some unique opportunities in Clan Boss.
Outside of Clan Boss, Demytha will be an excellent carry for any team. She will help sustain people with Continuous Heals on her A3 and a shield on her A1 to help protect low HP Allies. Her A2 will reduce the duration of debuffs on your team whilst also providing one of the most powerful heals in the game.
Demytha is good in Sand Devil but you need to speed tune her like in clan boss.
Demytha is a Legendary champion in disguise and top tier for any player at any stage of progression.