Unit/Skills

Every unit has a set of 4 skills specific to them, plus two Faction-specific skills. They are the most distinguishing characteristic of each unit as it defines specific actions or bonuses in combat for that unit.
The Unit Skills system unlocks at Player Level 34. It should be noted that until then, all units still possess their Ultimate skill at level 1, but this won't be visible in the user interface.
==Skill Level==
All skills start at level 1 and thorough the game may be upgraded.
However, the maximum level up to each a unit's skills can be upgraded is capped based on the unit's rank.
Once the rank is increased, all skills unlock a new maximum level.
Rank 	Skills Maximum Level
★ 	4
★★ 	5
★★★ 	6
★★★★ 	8
★★★★★ 	11
★★★★★★	15
Please notice that although manually upgrading a unit's skill level is capped to level 15, it is possible for a unit to have skills with level greater than 15 via specific Holy Emblems bonuses.
==Upgrading Skills==
Every skill has an associated level that can be upgraded by spending materials.
The maximum level of a unit's skills is decided 
The most significant materials spent to upgrade units' skills are Skill Crystals. These are primarily obtained via the Dragon Utopia PvE mode, as various rewards from the Guild Adventure, and purchasable in various Marketplace Stores.
Here is the equivalent Skill XP obtained by consuming each of these stones:
Stone Type 	Skill XP
White Crystal 	+10
Green Crystal 	+50
Blue Crystal 	+150
Purple Crystal	+450
Orange Crystal	+1000
Regular Materials (like Wood) and Books can also be used to increase a unit's skills, but are in general very inefficient cost-wise and it is recommended to avoid spending them this way. 
Note that the user interface is rather clunky especially for higher levels as it can take quite a while to spend large quantities of crystals. To speed the process, hold the crystal icon instead of manually tapping it repeatedly.
All skills start at level 1 and then require a specific amount of XP to upgrade to the next level. Please see the table below for the required amount for each level together with the equivalent number of crystals required (rounded up):
Skill Level	Required XP	 	 	 	 	
1 	- 	- 	- 	- 	- 	-
2 	200 	20 	4 	2 	1 	1
3 	300 	30 	6 	2 	1 	1
4 	400 	40 	8 	3 	1 	1
5 	550 	55 	11 	4 	2 	1
6 	1000 	100 	20 	7 	3 	1
7 	1750 	175 	35 	12 	4 	2
8 	2750 	275 	55 	19 	7 	3
9 	4100 	410 	82 	28 	10 	5
10 	5850 	585 	117 	39 	13 	6
11 	8000 	800 	160 	54 	18 	8
12 	10650 	1065	213 	71 	24 	11
13 	13850 	1385	277 	93 	31 	14
14 	17600 	1760	352 	118	40 	18
15 	22000 	2200	440 	147	49 	22
Cumulative 	89000 	8900	1780	594	198	89
==Regular Skills==
When a unit is recruited, it automatically starts with its specific Ultimate Skill (Common) at level 1.
As the unit progresses through tiers, three more specific skills can be unlocked for a fixed Gold cost. Skills are unlocked at level 1, become available immediately and can be upgraded at the player's discretion.
Unit Skill 	Tier Unlocked	Cost
1t Skill (Ultimate)	Common 	-
2nd Skill 	Blue 	10000
3rd Skill 	Purple 	50000
4th Skill 	Orange 	100000
Faction Skill(s) 	Red 	150000
Commander Skill 	6* 	200000
==Faction Skills==
All units reaching Red tier unlock 2 Faction-specific Skills. They obey rules similar to the Regular Skills with a couple of differences:
* Unlike the Regular Skills, all units in the same faction share the same two Faction Skills.
* There is only one Faction Skill slot. The player will unlock the slot. This is very similar to how heroes' Spell Mark works.
* Each choice skill must be upgraded separately. Unlike Spell Mark, the player does not upgrade the slot with both skills benefitting from it. It is recommended therefore for each unit to plan ahead the optimal choice to avoid skill stones waste!
* Only one Faction Skill can be active at a time. Out of combat, the player can toggle between the two skills freely. Please note that the choice is global - that is, different skill options cannot be simultaneously used for independent formations or play areas. This is similar to how Awakening abilities can be toggled.
Here is a list of all faction skills:
Faction	Skill	Description