Pack Tactics. The lion has advantage on an attack roll against a creature if at least one of the lion's allies is within 5 feet of the target and the ally doesn't have the incapacitated condition.
Rend. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit:15 (2d8 + 6) piercing damage. If the lion moved at least 20 feet straight toward the target immediately before the hit, the target must succeed on a DC 16 Strength saving throw or have the prone condition. If the target has the prone condition, the lion can make another Rend attack against it as a bonus action.
When it comes to infiltrating giant steadings, I must admit that spotted lions are in some ways preferable to, say, dire wolves or cave bears. Namely, if they're well fed, they're more likely to stretch and yawn than they are to raise an alarm when they spot you.