Your sheer mass of muscle makes you heavier than you look. When an effect would push or otherwise unwillingly cause you to move, the distance you are moved is reduced by 5 x your proficiency bonus. Your muscles over harsh training and brutal abuse, have become harder than raw iron. You gain a +2 to your AC as long as you are not wearing any form of armor or shield. Your carrying capacity (including maximum load and maximum lift) is doubled, and you have advantage on Strength checks made to push, pull, lift, grip, or break objects. (this does not stack with any other ability that also increases your carrying capacity and maximum lift).
On your turn, you can enter a rage as a bonus action. While raging, you gain the following benefits if you aren't wearing heavy armor:
Your rage lasts for 1 minute. It ends early if you are knocked unconscious or if your turn ends and you haven't attacked a hostile creature since your last turn or taken damage since then. You can also end your rage on your turn as a bonus action. You may only rage a number of times equal to your proficiency bonus per day.
You have connections to almost all illegal organizations and guilds in the city that your prison was in and surrounding countryside. You can invoke favors and connections to possibly gain safe lodging, send messages, or other favors from some organizations, but they may want something in return.