Hill Giant
Hill giants are removed from my game. Here is why:
i) I adopt a 4th edition approach to giants, as creatures originating from the Elemental Chaos. Hill giants appear as nothing more than enormous, natural humanoids. The other giants appearing in the 5e Monster Manual have more obvious ties to elemental origins.
ii) Hill giants are too similar to ogres. Ogres have STR 19, INT 5 and wield greatclubs. Hill giants have STR 21, INT 5 and wield greatclubs. They both look like large, ugly humans (admittedly, fifth edition has made ogres even uglier), and only 3 challenge levels separate them, despite one being large and the other being huge. By removing hill giants, the leap from ogres to giants is 5 challenge levels (2 to 7).
I would have ogres occasionally referred to as hill giants, as a misnomer, of course. Ettins are born of ogres with the frequency of twins.
Stone Giant
Stone giants are hairless.
Senses darkvision 60ft., tremorsense 60ft., passive Perception 14
Damage Resistances: bludgeoning, piercing, and slashing damage from nonmagical weapons.
At will: Mending (stones and minerals only)
1/day each: Meld Into Stone, Stone Shape
Frost Giant
Their hair resembles frost.
1/day: Fire Shield (chill shield)
Greataxe (Hit: 25 (3d12 + 6) slashing damage plus 5 cold damage).
Rock (Hit: 28 (4d10 + 6) bludgeoning damage plus 5 cold damage).
Their hair resembles embers.
1/day: Fire Shield (warm shield)
Greatsword (Hit: 28 (6d6 + 7) slashing damage plus 5 fire damage).
Rock (Hit: 29 (4d10 + 7) bludgeoning damage plus 5 fire damage).
Cloud Giant
Their skin is pearly white. Their hair resembles cloudstuff.
At will: Feather Fall, Fog Cloud, Levitation
3/day each: Fly, Misty Step, Telekinesis
1/day each: Control Weather, Gaseous Form
Morningstar (Hit: 21 (3d8 + 8) piercing damage plus 5 thunder damage).
Storm Giant
I want to align storm giants closer to the water element, so as to provide a greater distinction from cloud giants (air element). Storm giants have a deep sea green pigment. Their hair resembles seaweed. They live in or near oceans or enormous lakes.
At will: Create or Destroy Water, Water Walk
3/day each: Control Water, Tsunami, Water Breathing
Instead of a greatsword (Hit: 30 (6d6 + 9) slashing damage), a storm giants wields a trident (Hit: 20 (3d6 +9 or 23 (3d8 +9) if used with two hands to make a melee attack piercing damage plus 10 lightning damage).
Empyrean
At will: Create Food and Water, Greater Restoration
3/day each: Aura of Life, Aura of Purity
1/day each: Commune, Dispel Evil and Good, Divine Word, Plane Shift (self only), Raise Dead
Bolt (Hit: 24 (7d6) radiant damage). This damage ignores resistance to radiant damage.