Brennan the Fierce

Magic Resistance. Brennan has advantage on saving throws against spells and other magical effects.

Spellcasting. Brennan is an 18th-level spellcaster. His spellcasting ability is Wisdom (spell save DC 17, +9 to hit with spell attacks). Brennan can cast conjure elemental and control water at will and has the following druid spells prepared:

Cantrips (at will): frostbite, produce flame, magic stone, druidcraft, shillelagh*

1st level (4 slots): detect magic, healing word, snare, speak with animals

2nd level (3 slots): lesser restoration, spike growth, flame blade

3rd level (3 slots): dispel magic, call lightning, plant growth

4th level (3 slots): polymorph, guardian of nature*, stoneskin*

5th level (3 slots): mass cure wounds, scrying, wall of stone

6th level (1 slot): heal

7th level (1 slot): fire storm

8th level (1 slot): control weather

9th level (1 slot): true resurrection

*Brennan casts shillelagh and one of guardian of nature, stoneskin prior to combat.

Brennans Quarterstaff is the magic item Hither-Thither Staff

Quarterstaff. Melee Weapon Attack: +4 to hit (+9 to hit with shillelagh), reach 5 ft., one target. Hit: 3 (1d6) bludgeoning damage, 4 (1d8) bludgeoning damage if wielded with two hands, or 6 (1d8 + 5) bludgeoning damage with shillelagh.