Devil's Contract

With a welcome to the warlock's Company, they can touch up to 2 allies which gives them a resistance to spells and immunity to Necrotic spells at a price, roll a Int Save throw every time their turn begins. If they fail this then the enchantment dissipates and their damage dealt to any enemies this turn will be lowered by the result of a rolled d4. This effect doesnt occur if they can succeed in all 5 Int save rolls