RSS Beam do damage when attacking

[MYGO.pl]

Hi everyone, could someone make a plugin of a beam that does damage as seen in the video? https://www.youtube.com/watch?v=PMl9YIN_nSM It is a beam that a player can buy with ammo packs (you can do it with normal money, then I adapt it to buy with ammo packs).

the plugin consists of:

-It is a white beam/blue (like video)
-Only CT can buy.
-The white beam appears when a player shoots at the enemy.
-The beam can attack multiple players (if it is attacking it, like video).
-The beam does 10 hp damage every second.
-If the player stops attacking, it gradually disappears. (like in the video)
-The beam appears in a certain radius, I mean, it does not appear if the victim is very far away.

Could someone help me create this plugin please or could you give me an example to guide me please ... thanks in advance

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