Ripred summons his pact weapon as a Rapier. He then runs forward 25 feet towards the spiders, and fires a beam of energy at the one on the right.
Spoiler: Actions
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Bonus Action: Summoning Pact Blade
Move; 25 feet towards Spiders
Action: Eldritch Blast
Attack Roll: (1d20+5)[10]
Damage Roll: (1d10+3)[9] force damage

Potential Crit: (1d10)[2] force damage