Vakiel attempts to escape the grapple by using the hilt of his sword.

athletics check (on D&D beyond) - 13

wisdom save for end of turn - 14

RL athlerics check 15

The gnoll manages to hang on, it's armour taking the force of Vakiel's sword hilt blows.

The willow tree shakes, and two branches lash out at Augustin.

Attack 1: 23 Damage: 15 plus 6 necrotic damage.

Attack 2: 25 Damage: 6 plus 6 necrotic damage.

Esa yells "IT'S A WILLOWHAUNT! I REMEMBER NOW! IT CAN TAKE OVER MINDS! BUT ONLY CAN TRY AT THOSE WITHIN A CERTAIN RANGE! MOVE AWAY FROM IT!"

The twin ghost girls try to bite and claw Augustin, attempting to grapple him.

Ghost Girl 1

• Bite Attack: 21 Damage: 7.
• Claw Attack 1: Attack: 7 Damage: 8 and grapple on a hit.
• Claw Attack 2: Attack: 12 Damage: 8 and grapple on a hit.

Ghost Girl 2

• Bite Attack: 14 Damage: 8.
• Claw Attack 1: Attack: 23 Damage: 9 and grapple on a hit.
• Claw Attack 2: Attack: 22 Damage: 9 and grapple on a hit.

One of the girls manages to get hold of Augustin and is holding on to him. Augustin is grappled. 

"Bury us here!" she whispers to the paladin. "Bury us, free us!"

Updated map

Augustin shouts back at the children! “I will happily bury you and free you!” “But stop attacking us so we can help!”

Bonus action misty step towards Esa. On the “outside” of the walls. Somewhat between Esa and the action to run interference to anything that comes at her.

Action: Dodge.

RL's eyes will go wide in shock at the sudden disappearance of Augustin being between he, Vakiel, Grimbald and the Ghosts and tree.  

He will mutter a quick prayer to Melora as he casts Guidance on Vakiel that this time whatever is happening to the Barbarian stops.

Bonus action Shillelagh on his club

Grimbald will disengage to get outside the walls, and hopefully beyond the point he felt the initial pull on his mind by the willow

Esa targets the wounded ghost with a fire bolt.

Attack: 22 Damage: 11 fire damage.

The fire bolt vaporises the ghost and it shrieks and fades away. The other ghost, also shrieks, although in anger or grief, none of you can say.

"Keep at least 30ft from the willowhaunt!" Esa yells. "It should be enough! Maybe.. Someone get Fabio away from there!"

Vakiel, seeing his other enemies retreat in fear, will make another attempt to escape this grapple

athletics - 8

wisdom save - 20 + 4

RL athletics check 21

Vakiel grabs the gnoll and prises its hands off him and shoves it away. Where the hell did the others go? They must be fighting somewhere. All Vakiel can do now is kill these vermin and find them.

The remaining ghost continues to shriek and runs at Vakiel, leaping to land on him, clawing and biting.

Bite attack:

• Attack: 7 Damage: 11.

Claw attacks:

• Attack 1: 6 Damage: 8. Grappled on a hit.
• Attack 2: 7 Damage: 10. Grappled on a hit.

The willowhaunt uses its Whispers of Madness ability on RL:

RL must make a DC15 Wisdom save.

On a fail take 12 psychic damage and be affected by a short term madness. If the save fails by 5 or more, RL is affected by long term madness instead. Madness roll 90. 

On a successful save RL takes half the psychic damage above (round down) and is not afflicted by madness.

RL wisdom save 14

Will use inspiration for reroll if unsucessful

RL wisdom save using inspiration 16

Confirming that roll was a 16. D&D Beyond dice roller playing silly buggers. Successful save. RL takes 14 points of psychic damage.

RL comes up with a new plan.  He feints a grapple at Vakiel but will disengage and move south his 30 ft of movement while shouting and taunting Vakiel to try to get him to follow.

Bonus action healing spirit on the square Augustin is in.  3 points of healing for Augustin