New Hero will not be available in the Hero Selector. Last time Shane is not inside because she was still a new Hero.

Was it after map 8 is released?

Just get both as their passive can stack.
60% physical damage + 25% damage up for your team.

However, Rina and Dellons passive doesn't stack.

There's two events for the new 8th map if you haven't notice.

1) Collect new heroes from 8th map. Rewards as follows:
1 Hero: 10000 Gold
2 Heroes: 30 Keys
3 Heroes: 4-Star Hero Ticket
4 Heroes: 50 Keys
5 Heroes: 50000 Gold
6 Heroes: 5-Star Hero Ticket

2) Post a screenshot of 5 new heroes from 8th map on Mobirum. You can get a free 4* hero card from this.

This event will ends on 17th Dec (before maintenance).

Check this link for the event details.
8th map event

Did you just collect your 6* Hero Selector from daily login?
Developer already notice the bug but didn't fix it yet.
You can refer here. LINK

Yuri good for Arena.

Yeah. I was stuck around 2700 pts a few days ago before I use her. Manage to go up to 2900+ but didn't have time to breakthrough 3000 tier.

Eileene and Lina passive can stack.
60% + 50%.

Espada more worth in long run. Daisy passive may seems good now, but there will be a heroine who can make your team immune to AOE for 3 turns.
But that will be when they release map 9.

Which 7K you wanted to try?
You can easily create new accounts in your PC using Nox (android simulator).

Wah, super jealous of you liao.

Go for Velika for easier farming and one shot opponent team in PvP.

Since you got Ace, you won't need Yuri liao.

Other than your Hero equipment, also depends on your player Mastery and Formation.

Yeah. If I get Sieg, I will definitely use him to replace Karon in my Dragon raid team 1 and put in Lina as healer instead.

I picked Shane for my hero selector for transcending in the future.
You need to play harder to power up your existing heroes, bro.

First of all, download Nox (android simulator) and install on your PC.
There's a Multi Drive on Nox in which lets you run mutlple game at the same time.

For existing account, you can't change the server anymore.
For new account, try VPN to countries outside Asia.

According to Developer's Note at Mobirum:
Karin, Leo, Victoria is going to get their passive skill revamp in the near future.
Team immunity to Instant Death for Karin & Leo.
Team immunity to Electrify for Victoria.

Unexpectedly, Lucy is going to get a surprise development as well.

New Developer's Note. Guild Battle coming early next year.
Source

When climbing floor 61 onwards, I use 4-1 formation with lv32 Evan in front.
If Rudy day, then I just replace Evan with Rudy instead.

I was lucky with fusion last night. Got a 4* Ace.