Spellcasting (Humanoid Form Only). Yselm is a 9th-level spellcaster. Her spellcasting ability is Wisdom (spell save DC 15; +7 to hit with spell attacks). She has the following druid spells prepared:

Cantrips (at will): druidcraft, guidance, shillelagh

1st level (4 slots): absorb elements, fog cloud, jump

2nd level (3 slots): spike growth, moonbeam, pass without trace

3rd level (3 slots): conjure animals, sleet storm, dispel magic

4th level (3 slots): fire shield, polymorph

5th level (1 slot): maelstrom

Multiattack. Yselm makes two melee attacks.

Ice Sickle (Humanoid Form Only). Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 3 (1d4 + 1) slashing damage plus 5 (2d4) cold damage.

Maul (Beast Form Only). Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 3 (1d4 + 1) piercing damage.

Change Shape. Yselm magically polymorphs into a beast form—fox, mountain goat, owl, or wolf—or back into its humanoid form. Any equipment she is wearing or carrying is absorbed or borne by the beast form (Yselm's choice). She reverts to its humanoid form when it dies. Yselm's statistics are the same in each form, except where noted in this stat block.