You need to level up your heroes for many reasons. They are:
The experience needed to reach lvl 30 are the same for every hero on the same tier.
Explanation: This mean all 4 star heroes need a same amount of exp to reach lvl 30. Higher tier (5 and 5 stars) need more exp and the lower tier (3 stars and below) needs less EXP. You can see the table below to know their exp requirement.
Note: I calculate this by myself by keep grinding on the normal crystal cave stage level 1 (1600 EXP). The number may not be perfect but still quite accurate.
|Hero Tier||EXP needed||Crystal Cave – 1 Run|
|1 Star||52800||33 times|
|2 Stars||64000||40 times|
|3 Stars||70400||44 times|
|4 Stars||80000||50 times|
|5 Stars||91200||57 times|
|6 Stars||103,700||65 times|
You can help your weak hero to grow up fast by bring them to the “high” level place and let the strong heroes do the job.
My favorite place for power leveling is Crystal Cave (mission 5) level 1 (underground cave), it gives 1600 EXP and the enemies are very easy and they won’t attack the back row. Use the formation like shown on the screenshot below
The enemy won’t attack the weak heroes because there are heroes who block the path to them. You can keep training on this level, or if you have stronger power leveling heroes then move to the Skull Rock Pinnacle Level 1, this place gives you 2390 XP, the enemies are also easy, however they can attack your back row, so I advise you to train the “weak” heroes on the Crystal Cave level 1 first, after you reach lvl 10 – 15, start switch into Skull Rock Pinnacle level 1.
My suggestion is to always train on the first level on every mission because the exp changes between level on the same mission is very small (35 exp difference in the normal difficulty).
You can also power leveling on the hard difficulty if you have strong farmer heroes (Fire elementals, and any heroes who can attack the entire area). Remember that normal difficulty only cost 3 energy and the hard difficulty cost 4 energy. However, the hard difficulty have better drop rate for equipment, gems, and can also drop 3 star heroes.
Good spot for farming on hard difficulty
If you have any questions or suggestions, simply leave them on the comment. Thank you very much.