There are some good legendary troops that you can target in Delves, one that helps with Rowanne teams to blaze through low level explore/challenges is the Maraji Queen. She allows Elementals (Rowanne) to start with half mana, but on the other hand it relies on having a generous bonus of armor that you usually lack until a bit later.
So this is a tip to keep in mind regarding the Legendaries you can more reliably target with Delves. Gobbletruf (or something like that) from Amanitrax is also a very reliable legendary for those who like to play with Goblins.
The problem about traits: You will need to unlock certain traits in your teams, specially for the legendaries and Mythics when you acquire them, The best way to do it, without grinding until your mind goes numb from the repetition, is to use some Orbs of Wisdom, you maybe have some minor orbs from your guild completing some events and the best cost/benefit to use them is to always use a Minor Orb on the last trait because these are the most expensive. For Mythics you can even use two Minor Orbs since even the second trait is a bit costly.
You’ll save time and spare yourself of the mental fatigue and no. You’ll not miss those orbs to craft Zull Goth in the future… The Orbs of Ascension are the ones you should save. By the time you get them to craft Zull you’ll have a lot of Orbs of Wisdom to spare.
About King Silenus: He is nice, like a little Ketras, The Bull, hits three enemies, is Impervious and makes all Wildfolks start with half mana. You could play him with Ragnagord untraited since you get the benefits of the 50% mana anyway. You can use your Hero with Anu’s Scepter to have another troop able to destroy gems and generate mana for the team, and the fourth slot could be another Wildfolk of another color/s that won’t mana-block or get mana-blocked by the the other three I suggested.
General suggestions: I like Emperor Khorvash, and you have a chance to get him with Event Keys this week, other troops from Leonis Empire are also nice to play with like Amira, Lion Prince and Tigraki Warrior, you have a good chance to get more copies of Tigraki Warrior if you purchase tiers in the upcoming Bounty Event starting tomorrow.
Bounty Events are nice Solo-Events (in the sense that you don’t help/get help from your guildmates), and they can give you a fair amount of rewards for little to no investiment at all.
All bounty troops are Rares, you can get them from Gold Chests and they are cheap to trait. It’s very important to trai them so you can get the full score bonus. And I can suggest my own team for you to test out if you can:
Soldier of Wrath
The banner is any banner that gives bonus to Red and Blue Mana, if you have Faction banners Fangmoor works (+2 +1 -1 ), but Sunken Fleet is better (+2 +1 -1 ) because you won’t lose mana that Tigraki warrior can use.
The tactics are simple: The team has spells with true damage, Crysturtle is a good tanker with Stoneskin and it cam transform gems to Brown so you can fill Tigraki Warrior and snipe out the enemies. The stronger the enemies the more damage Tigraki Warrior can cause because his spell is boosted by the enemy’s armor. Soldier of Wrath and Rift Lynx can help too since their spells combined will also usually kill a single target.
Try to ignore skulls, it removes armor of the first enemy and it reduces the damage of Tigraki Warrior, but you can just target the other enemies below the first one as well and leave him for later. Rift Lynx is nice to push an enemy to the last spot and leave him mana-blocked by his other allies.
It’s a pretty straight-forward team, basic math with true damage and you are good to go as long as the whole team is traited for extra bonus score. You could buy the shop tiers for the Potion of Enchantment, it makes battles faster and gives you more sigils to maybe recover the gems you used. You can just as well not spend a single gem and still get some nice rewards with gems and orbs included.
I hope these points help you.