No one will see that coming!Use repeated castings of wall of stone to build a bridge across the sea.
Supposing you want the six-inch-thick version, and half-length because the span is greater than 20 feet, and the lich is willing to burn 5 spell slots per day on this, you'd get 250 feet of bridge per day. Suppose they made the bridge at a narrow point that was only 250 miles across, you'd need 5,280 days of casting -- a little under 14 1/2 years! That's, like, no time at all for a lich.
Use repeated castings of wall of stone to build a bridge across the sea.
Supposing you want the six-inch-thick version, and half-length because the span is greater than 20 feet, and the lich is willing to burn 5 spell slots per day on this, you'd get 250 feet of bridge per day. Suppose they made the bridge at a narrow point that was only 250 miles across, you'd need 5,280 days of casting -- a little under 14 1/2 years! That's, like, no time at all for a lich.