First of all, You start off with 100 (it used to be 500, so this may vary as the game evolves) crystals when you buy the game.
Also, it's good to understand that crystals are the only permanent currency featured in Hero-Siege. Gold is dropped upon death, but crystals will always be kept, until spent that is!
After the start of the game, you can gain more ...
From the way it is worded I would have to say you should be selective since it decreases with every one you pick up. Having 35 relics would take a little while to get however so this tactic should only be used by experienced players that will have longer runs where maxing out is an issue. I can see this being somewhat useful if you get a relic you just don't ...
Relics are items that will help improve your game-play in some way. They are the games take on upgrades.
There are four kinds of relics:
1. Weapon Enhancements: These are Relics that give your weapons extra powers.
2. Passive: These are Relics that improve your characters skills.
3. Active: These are Relics that need activation, therefore you ...
You have to activate all the switches on the map, then a statue awakens and kills enemies.
But not all levels have switches, so in some of them the statues are only decoration.
The switches appear randomly on levels in Act V, which you need DLC for.