Cap's Cloak

Choose up to six creatures within 60 feet. All of them are granted resistance to the triggering damage type until the start of your next turn. In addition, the caster can empower their next attack roll with the siphoned energy. Their first melee attack that hits in the next turn can add 1d4 for each person who was protected.
The type is determined by rolling a d12 on the following table. 
1 - fire
2 - cold
3 - lightning
4 - thunder
|5 - acid
6 - magical bludgeoning/slashing/piercing (1d3)
7 - necrotic
8 - radiant
9 - poison
10 - psychic
11 - force
12 - any 2 (your choice)

At Higher Levels.  
The damage goes up 1d4 per protected person per each higher level of spell slot that is used. 

Cap's Magical Experiments: 
You can attempt to cast it with an Arcana roll (15) +the spell level (4) Then each time you attempt to cast it, the DC reduces by one. When the DC reaches zero, you've fully memorized the spell. 
Spell Mastered.