Arcana skill used with Detect Magic (HOMEBREW)

 Detect Magic senses the presence of magic within 30 feet. You can use your action to see a faint aura around any visible creature or object in the area that bears magic, and you learn its school of magic, if any.

You can make one Arcana skill check with each casting of Detect Magic.  The DCs are as follows:

Very easy - 5 (Identify single, main function of magic)

Easy - 10 (Identify one additional function of magic)

Medium - 15 (Identify all functions of magic)

Hard - 20 (Identify presence of curse)

Very hard - 25 (Identify all details of curse)

Nearly impossible - 30

This check cannot be made without proficiency in the Arcana skill.

Abilities that recharge on a short rest

 In order to ensure fairness to classes with abilities that recharge on a short rest, the recharge should be changed to “Once you use this ability, you can’t use it again until you roll initiative at the start of combat or until you finish a short or long rest.”

Vicious Mockery fix

 . . . have disadvantage on the next attack roll it makes before the end of its attack rolls until the beginning of your next turn.

This fix would enable Vicious Mockery to scale well.

Staff of the Woodlands (modified)

I am quite fond of this staff, however, I would prefer the following changes:

REMOVE
(i) Wall of Thorns (6 charges) and

(ii) Tree Form

ADD
(i) Shillelagh;
(ii) Mending

(iii) Goodberry (1 charge); and
(iv) Plant Growth (3 charges)

Note, I interpret Mending as capable of healing plants (not plant creatures).

Winter Domain (*work in progress)

Bonus Cantrip
When you choose this domain at 1st level, you gain the Frostbite (PotA) cantrip.

Child of Winter
Also at 1st level, you gain resistance to cold damage.  Additionally, you can tolerate temperatures as low as -50 degrees Fahrenheit without additional protection.  If you wear heavy clothes, you can tolerate temperatures as low as -100 degrees Fahernheit.

Channel Divinity:  Nip in the Air
Starting at 2nd level, you can use your Channel Divinity to radiate the numbing chill of winter, dealing cold damage to your foes and hindering their movements.
As an action, you present your holy symbol, and each hostile creature within 30 feet of you must make a Constitution saving throw.  On a failed save, a creature takes cold damage equal to 2d10 + your cleric level and its speed is reduced by 10 feet until the start of your next turn. On a successful save, the creature takes half damage, but suffers no other effect.

Winter Domain Spells
Cleric Level Spells
1st - Armor of Agathys, Ice Knife (PotA)
3rd - Slow, Snilloc's Snowball Swarm (PotA)
5th - Feign Death, Sleet Storm
7th - Blight, Ice Storm
9th - Antilife Shell, Cone of Cold

Frosty
???/snow-covered enemies (debuff)/snow coating of self (buff)/conjure snowman (utility)

Potent Spellcasting
Starting at 8th level, you add your Wisdom modifier to the damage you deal with any cleric cantrip.

Frigid Body
Each hostile creature within 10 feet of you cannot take reactions.

Tempest Domain (HOMEBREW)

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Level 1 - (Tempest domain) Bonus Proficiencies - gain proficiency with martial weapons and heavy armor.

Level 1 - (Tempest domain) Bonus Cantrip - Shocking Grasp cantrip.

Level 1 - (Tempest domain) Wrath of the Storm.

Level 1 - Tempest Domain Spells

Cleric Level Spells

1st - Fog Cloud, Thunderwave

3rd - Gust of Wind, Shatter

5th - Call Lightning, Sleet Storm, Thunder Step (Xanathar's)

7th - Conjure Minor Elementals (Air-based or Water-based only), Control Water, Ice Storm, Storm Sphere (Xanathar's)

9th - Destructive Wave, Insect Plague, Maelstrom (Xanathar's)

Level 2 - (Cleric) Channel Divinity:  Turn Undead.

Level 2 - (Tempest domain) Channel Divinity: Destructive Wrath - deal maximum damage to lightning or thunder damage.

Level 4 - (Cleric) Ability score improvement (WIS 18, +4).

Level 5 - 2 dice of damage for cantrips

Level 5 - (Cleric) Destroy Undead - Turn Undead destroys undead of CR 1/2 or lower.

Level 6 - (Tempest Domain) Thunderbolt Strike - when you deal lightning damage to a Large or smaller creature, you can also push it up to 10 feet away from you.

Level 6 - (Cleric) Channel Divinity - 2x between rests.

Level 8 - (Cleric) Ability score improvement (WIS 20, +5).

Level 8 - (Tempest domain) Divine Strike.

Level 8 - (Tempest domain) Potent Spellcasting.

Level 8 - (Cleric) Destroy Undead - Turn Undead destroys undead of CR 1 or lower.

Level 10 - (Cleric) Divine Intervention.

Level 11 - 3 dice of damage for cantrips

Level 11 - (Cleric) Destroy Undead - Turn Undead destroys undead of CR 2 or lower.

Level 12 - (Cleric) Ability score improvement.

Level 14 - (Cleric) Destroy Undead - Turn Undead destroys undead of CR 3 or lower.

Level 16 - (Cleric) Ability score improvement.

Level 17 (Tempest domain) Stormborn - At 17th level, you have a flying speed equal to your current walking speed whenever you are not underground or indoors.

Level 17 - 4 dice of damage for cantrips

Level 14 - (Cleric) Destroy Undead - Turn Undead destroys undead of CR 4 or lower.

Level 18 - (Cleric) Channel Divinity - 3x between rests.

Level 19 - (Cleric) Ability score improvement.

Level 20 - (Cleric) Divine Intervention - succeeds automatically.

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Beast Speech (Druid)

Beast Speech (see Circle of the Shepherd) should be a 3rd level class feature for all druids.  It reads as follows:

Beast Speech

At 2nd 3rd level, you gain the ability to converse with beasts. Beasts can understand your speech, and you gain the ability to decipher their noises and motions into recognizable words and phrases. Most beasts lack the intelligence to convey or understand sophisticated concepts, but a friendly beast could relay what it has seen or heard in the recent past.

This ability does not grant you any special friendship with beasts, though you can combine this ability with gifts and other favors to curry favor with them as you would any other nonplayer character.