Spriggans from Elder Scrolls V: Skyrim
"Spriggans, often called "Nature's Guardians" are tree spirits usually found all around Tamriel in areas of dense forest and underground. They are able to summon Black Bears to assist them in combat and fully heal themselves when badly hurt. In skyrim they are made up of pure energy, the source of this mystic energy being their Taproot.
The Cyrodilic Spriggans, unlike their Solstheim counterparts, are unable to resurrect themselves, as the Solstheim Spriggans can resurrect themselves two times, growing stronger both times.
Their beauty in combination with lethality is reminiscent of Sirens, or more relatable, the use colors and beauty as an indicator to a plant's or reptile's deadly poisons." (wiki)