You gain one of the following benefits of your choice. Whenever you gain a Warden level, you can replace the chosen benefit with another one.
Stalwart Spirit
You gain proficiency in one saving throw of your choice.
Steadfast Toughness
Your Hit Point maximum is increased by your Constitution modifier plus your Warden level. If you later replace this choice, your Hit Point maximum no longer receives this increase.
Tower Shield
While you are holding a Shield, you have a +3 bonus to your AC instead of +2. At Warden level 10, this bonus increases to +4.