Path of the titan

A terrible curse flows trough your bloodline.  Those who live with it assume their shortlife time.  Power and strengh flow trough your veins and you learn to transform yourself into a powerfull being for a short period of time. In your new form, you gain specific skills depending of your curse. 

Natural armor

At level 6, trough the effect of your curse, you learn to harden your skin to protect yourself against anykind of attack. Your skin being tough to pierce, it became a shield itself, making it difficult for your foes to hurt you. You gain a permanent +2 to your AC. You also gain the ability to cast the spell Earth Tremor  at level 1 without spell component. You can use this ability a number of time equal to your constitution modifier. You regain all uses after a long rest.

Growth

At level 3, you learn the spell Enlarge. You can cast it without any spell component and without concentration. While enlarge, you add 2d6 damage to your melee attack. 

You can use this feature a number of times equal to constitution modifier, and you regain all expended uses when you finish a long rest.

Charging blow

At level 10, you learn to focus all your energy by sacrificing your motion. If you reduce your speed to 0 at the beginning of your turn, you can can focus your energy direct in your fist, making it hard for your foes to defend agains its. You gain a +5 to attack roll. If you hit your opponent, you add 2d8 damage to your melee attack.     

Gigantification

At level 14, you learn to push your cursed to its full potentiel. You can make your self as large as a giant. Your size is huge. You add 2d12 to your melee attack. 

You can stay in your form for a duration of 1 minute. At the end, when you regain your normal size, you suffer 2 points of exhaustion. 

You also learn the spell earthquake without anyspell component and without concentration. You can use this spell a number of time equal to half your constitution modifier rounded up (minimum 1). You regain all uses after a long rest. You can cast this spell only while your are in your giant form.