You can upgrade your heroes using the Glyphs feature since the 30th team level. Enchant the Glyphs to level them up and to gain bonuses for the following stats (each hero has their own set of Glyphs):
- Physical/Magical attack
- Armor penetration
- Magic defence
- Magic penetration
- Critical hit chance
The Glyphs enchantment is available only to guild members. If you are not in a guild, you won't be able to collect runes and enchant Glyphs.
You need Runes to enchant Glyphs: Common, Rare and Great enchantment runes. You can receive them as a reward for guild's activity. Each of these runes can be used to upgrade a Glyph. Common rune gives 20 enchant points, Rare rune gives 50 enchant points, Great rune gives 100 enchant points.
As well as that you can use Small enchantment runes which give 10 enchant points each. You can receive them when completing certain daily tasks.
The Glyphs are enchanted in the Guild Forge - open the 'Guild' menu and hit 'Forge' button:
Choose a hero (they must be of 30th lvl or higher).
You will see the Enchantment window:
In the left part of the window, you see the available Glyphs. Locked glyphs will become enchantable when your hero reaches a certain rank (the requirements are displayed in the right part of the screen when you click the locked Glyph).
Choose a Glyph to be enchanted. In our case, it is a Physical attack. In the right part of the screen, you see the progress bar and resources for enchantment.
Click the resource icons to use them for enchantment. If you click some of them by mistake - don't worry, you can undo the choice by hitting the red circle in the upper right corner of the icon.
The progress bar will be filled while you choose the resources. To level up the Glyph from lvl 0 to lvl 1 you need 100 enchant points. If you don't have enough resources to get 100 enchant points you can still enchant the Glyph, but it will not receive a new level.
Hit the 'Enchant' button to confirm.
You can also purchase enchant points needed for reaching the next level using emeralds.
For example, we need 50 enchant points to level up the "Health" glyph. You can use runes, or level up the glyph for emeralds or combine these two ways. In the last case, you need to use runes first and hit the enchant button and then you will be able to buy the enchant points needed to reach the next level using emeralds. The cost depends on the amount of enchant points you buy.
When a Glyph receives a new level you will see a stat bonus:
There is also a new tab in the Hero's window: all Glyphs are displayed there. You can open the Forge window right from this tab: