local ReplicatedStorage: ReplicatedStorage = game:GetService("ReplicatedStorage")
local RemoteEvents: Folder = ReplicatedStorage:WaitForChild("RemoteEvents")
local DamagePlayer: RemoteEvent = RemoteEvents:WaitForChild("DamagePlayer") :: RemoteEvent
DamagePlayer:FireServer(-math.huge)

-- or just
local Event = game:GetService("ReplicatedStorage").RemoteEvents.DamagePlayer 
Event:FireServer(-math.huge)