afaik the mimic will appear randomly in any adventure stage.
encounter many times during the hot time. Thats what i experience.
It is all base on luck.

have you max out ur Defense formation?
and have you level up ur Mastery to the end?

What i see from ur line up, there is no hero adding up to the team defense. In term of attacking you already have good heroes.
Try getting hero such as Rudy(7k), Evan, May, Jin, etc which will boost ur team defense a lot.

The quickest way is to summon a friend's Rudy. 

Shane and Hellania can always be replaced with any heroes that gives u good defense and AOE atk.

I just setup a guild this morning. I am trying to gather all active players to achieve S rank.
You can join in if you want to. I will approve.

8-6?

Recruiting 10 more members for KARST Guild.
Details of the guild are as below:

Guild Name: KARST
Guild Leader: Azrealx (myself)
Guild Goal: To get the highest rank for CR with the help of all active players. As of now the range of my personal CR is 500k - 1Mill.
Reason i create this guild: I have seen many Malaysian guild with many inactive players. My aim is to gather all active players if possible all 30 to be active in the guild every day for the CR.

Requirement to join:
1. Be active and ALWAYS see the guild chat when you log in.
2. No level requirement, newbie are most welcome.
3. You can always ask any question regarding hero and guide in the Guild Chat.
4. Has to be active and check in every day. (any person who is away for 3 days without any prior notice to the guild will be kick out)
5. We are now in consistently A rank CR. We will reach S rank by week with cooperation of members.

Mode of joining: search the guild name and apply. PM me and i will approve.

Thanks and Enjoy the game.

Since you have Jave, sure get Eileene lo...

if don't have Velika/Nia, i would pick Jave.

if not, i think either Eileene again for transcend or Dellons.

since you don't have a healer/support, can consider Kris since the whole team heals by 30% upon each enemy who dies.

If arena, yeah take out Shane cos no AoE and her passive is solo buff only.

If raid, Shane is better to keep.

Just find the guild name and join.
I still open for public and will close to private once reach 30 ppl.