Training Center

The Training Center is a part of buildings in Castle Clash where is trained Troops for upgrading and unlocking but you can’t upgrade the building. You can upgrade Troops by using Gold as resource. If you want to upgrade Troops promptly then you have to use Gems which I say the main resource of this game of IGG. When a Troop will be switched level 2 to level 5 then a new, more robust type of Troop will be unlocked.  There are four types of Troops in tier of Five:

1. Guardian- Normal – They go rapidly but can only raid on the ground things.
2. Hunter- Ranged – they are less effective against melee but strong against flying enemies.
3. Pyromancer – Magical - Low HP but much attack rate.
4. Treant- Destructive - They aim at towers first and Treant and Mecha Man always attack heroes with flying.

When Troops will be reached at level 5, they gain high HP and DMG but it also concern about high cost to make them. Troops will be changed their colors, every single level up.

The chart table shows upgrading time for per level. 

Tier	Level 1	Level 2	Level 3	Level 4	Level 5
1	-	3m	7h	1d1h12m	2d2h24m
2	-	3d3h36m	4d17h24m	7d2h6m	10d15h9m
3	-	12d18h10m	15d7h24m	18d8h53m	22d1h3m

This chart table shows gaining the Might per upgrade. 

Tier	Level 1	Level 2	Level 3	Level 4	Level 5
1	8	16	24	32	40
2	50	65	80	95	110
3	150	180	210	240	270

This chart table describes upgrading the Gold cost per level.

Tier	Level 1	Level 2	Level 3	Level 4	Level 5
1	-	7,000	30,000	50,000	100,000
2	-	214,000	390,000	550,000	950,000
3	-	1,003,200	1,562,000	2,070,000	3,340,000

This chart table describes for the level which needs to unlock a particular troop level.

Tier	Level 1	Level 2	Level 3	Level 4	Level 5
1	-	-	-	1
2	3	6		9
3		10	14	15	17

As an expert I suggest you that initial level of the game Troops are necessary and it will help you to make easy to win Raid, Dungeons but in a certain level like 50k Might the Troop are actually less important for you. By upgrading the Troops you will be benefited a little. But I really like the flying Troops, they are looking nice when they guard the base.

Thanks.