Ability Score Adjustments

Your Strength score increases by 2, your Constitution score increases by 1, and your Dexterity and Intelligence scores are each reduced by 1.

Size

Half-giants stand between 10 and 14 feet tall and possess massive builds. Your size is Large.

Speed

Your base walking speed is 35 feet.

Languages

You can speak Common and Giant.

Giant’s Toughness

Your hit point maximum increases by 2 per level (including +2 at 1st level).

Large Hands

Your massive hands are built for weapons and tools crafted for your size. You can wield Heavy and two-handed melee weapons with one hand. You can engage in two-weapon fighting using a Light or versatile weapon sized for Large creatures in your off-hand. Large-sized Light/Versatile weapons use the same statistics as their standard counterparts. When you attempt to use any weapon or tool sized for Medium or smaller creatures, you make the associated attack or ability check with disadvantage. Additionally, each time you use such an item, roll a d20. On a result of 10 or lower, the item breaks and becomes unusable.

Giant Body

Half-giants find most equipment crafted for Medium creatures awkward and undersized.
You cannot wear armor sized for Small or Medium creatures. Armor, clothing, and lodging crafted for your size cost twice as much as normal. You require three times the food and water of a Medium creature each day. Work with your DM to establish which spaces your character can fit through. As a general guideline, you can squeeze through a 5-foot opening following the standard squeezing rules.

Cloud Giant Ancestry

+2 to Intelligence and –1 to Strength.
You gain proficiency in Perception; 

Cloud step
As a Bonus Action, you can magically teleport up to 30 feet to an unoccupied space you can see.
You can use this feature once per long rest.

Future sight
Your connection to the skies grants you prophetic insight. Once per long rest, you can cast Augury without requiring spell components or a spell slot. Intelligence is your spellcasting ability for this spell. This increases to twice at 11th level

Fire Giant Ancestry

+1 to Constitution and fire resistance.
You are naturally acclimated to hot environments. You have proficiency in Smith's Tools. When making ability checks using Smith's Tools, you have advantage.

Fire Rage
Once per long rest, when you hit a creature with a melee attack, the sheer fury of your giant blood erupts through your strike, momentarily breaking your enemy's will to fight. The target takes 1d6 fire damage and must make a Constitution saving throw (DC 8 + your proficiency bonus + your Constitution modifier). On a failed save, the target has disadvantage on its next attack roll. Starting at 7th level, on a failed save the target also has disadvantage on the next saving throw it makes before the end of your next turn. You can use this feature twice per long rest at 7th level, and three times at 13th level.

Frost Giant Ancestry

+1 to Strength and cold resistance. You are naturally acclimated to cold environments and ignore difficult terrain caused by ice, snow, or extreme cold. You have proficiency in Survival. When making a Survival check, you have advantage.

Frost rage
Once per long rest, when you hit a creature with a melee attack, the impact sends a wave of paralyzing cold through the target. Until the start of your next turn, the target's movement speed is halved. You can use this feature twice per long rest at 7th level, and three times at 13th level. 

Hill Giant Ancestry

+1 to Constitution and –1 to Intelligence.

You gain proficiency in Animal Handling and Nature.

Crushing Grip
You have advantage on ability checks made to grapple a creature. Once per long rest, when you successfully grapple a creature, it must make a Strength saving throw (DC 10 + your proficiency bonus) at the start of each of its turns while grappled. On a failed save, it takes 1d4 bludgeoning damage (increases to 1d6 at 11th level). On a successful save, it takes no damage. You can use this feature once per long rest. This increases to twice at 7th level, and three times at 13th level.

Stone Giant Ancestry

+1 Strength and –1 Charisma.

You have darkvision out to 60 feet. You have proficiency with Mason's Tools. Additionally, when underground or in a stone environment, you have advantage on Perception checks.

Stone throw
As a bonus action, you hurl a rock at a creature within 30 feet that u can see. The target takes 1d6 bludgeoning damage. If the target is no more than one size larger than you, it must also make a Strength saving throw (DC 8 + your proficiency bonus + your Strength modifier) or fall prone. You can use this feature twice at 7th level, and three times at 13th level.

Storm Giant Ancestry

+1 Dexterity and lightning resistance.

You have darkvision out to 90 feet. You can also see normally underwater up to 90 feet. You are naturally acclimated to both hot and cold water environments. You have a swimming speed of 20 ft, and you can breathe underwater.

Storm Wrath
Starting at 7th level, as an action you call down lightning from the sky. Choose a point you can see within 120 feet. A storm cloud appears in the shape of a cylinder that is 10 feet tall with a 60-foot radius, centered on a point you can see within range directly above you. The call fails if you can’t see a point in the air where the storm cloud could appear (for example, if you are in a room that can’t accommodate the cloud). Choose a point you can see under the cloud. A bolt of lightning flashes down from the cloud to that point with a 10 feet radius. Each target in that radius must make a Dexterity saving throw (DC 8 + your proficiency bonus + your Wisdom modifier) or take 2d10 lightning damage, half on a success. The storm lasts for 1 minute or until you have called down 5 bolts, whichever comes first. This feature requires concentration and ends early if your concentration is broken. Once you use this feature you cannot do so again until you finish a long rest. The damage increases to 3d10 at 11th level, and 4d10 at 14th level.

If you are outdoors in stormy conditions when you use this feature, the spell gives you control over the existing storm instead of creating a new one. Under such conditions, the spell’s damage increases by 1d10.