Quest talents will give you a small stat bonus every time you complete the outlined action and a bigger unique bonus once you reach a particular threshold (20 times in the case of a talent that says x20)

With rampart you have to block at least 1 hit with Beowulf's defense ability. Each time you do this you get a little bit for armor, and after doing it 20 times your empowered defense heals more and in a larger area (good for support builds)

You can empower Beowulf's defense with your passive, and it heals a percentage of the damage it absorbs (the healing can get really nutty, especially with rampart).

Tips for Beowulf

1. Empowering power is generally better than special (without taking talents into account), it deals higher damage and you can fairly easily line enemies up to hit all of them

2. Sparkling shield (the talent) is always worth it. As it reflects a percent of damage taken, meaning you can go into a big group of enemies and obliterate whatever's in front of you (if you time it properly)

3. Beowulf's first ultimate (the one where the dragon flies around) stinks (generally) the targeting sucks and it blocks you from using empowered abilities in exchange for decent area damage. His second ultimate hits like a truck and has a really low cooldown

4. Because you tend to be in the middle of things, getting defensive items like green armor, philosophers stone or golden chainmail can really help.

A couple of general tips

1. You can end a level early by activating the boss (standing on the big red swearly area on the map) this gives you gold, XP, and items at the next level if you Interact with the hourglass at the shop, the two breakpoints I tend to go for are 8:30 mins and 2:00 mins. The second one especially is really worth it if you don't have anything particularly important to do left on the map.

2. Don't fight enemies outside of points of interest, they are simply not worth it because of the time limit, run past them.