Upgrading Dr Stevens from Survival Road

Just got Dr Stevens from Survival road, and for first upgrade I need Multi tool Knife

But for the time being, the Sleeping Bag is on Extreme Sale and I wonder if I need that too for upgrading him to stage 3 or 4.

☆5→knife
☆4→sleeping bag

ok, so don’t need sleeping bag, thx

you need 7 knives to max him…1 for tier 2, 2 for tier 3 and 4 for tier 4

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