Boosters are in-game advantages you have, if you buy them with golds, they are not too expensive. There are 7 boosters in total:
The X-ray vision allows you to see through walls and see players from other teams. The price from 5 golds. to 50
The jump height allows you to change the height of the jump in % The price is from 5 golds. to 50.
The poison resist allows you to be invulnerable to poison. The price is from 5 golds. to 50.
The x2 ammo allows you to have x2 ammo. The price is from 5 golds. to. 50
The speed increase allows you to have from 5% to 100% of more speed. The price is from 5 golds. to. 50
The HP increase allows you to have from %25 to %200 more HP. The price is from 5 golds. to. 50