\subsection{Blade Barrier}\label{blade-barrier}

\emph{6th-level evocation}

\begin{itemize}
\tightlist
\item
  \textbf{Casting Time:} 1 action
\item
  \textbf{Range:} 90 feet
\item
  \textbf{Components:} V, S
\item
  \textbf{Duration:} Concentration, up to 10 minutes
\end{itemize}

You create a vertical wall of whirling, razor-sharp blades made of
magical energy. The wall appears within range and lasts for the
duration. You can make a straight wall up to 100 feet long, 20 feet
high, and 5 feet thick, or a ringed wall up to 60 feet in diameter, 20
feet high, and 5 feet thick. The wall provides three---quarters cover to
creatures behind it, and its space is difficult terrain.

When a creature enters the walls area for the first time on a turn or
starts its turn there, the creature must make a Dexterity saving throw.
On a failed save, the creature takes 6d10 slashing damage. On a
successful save, the creature takes half as much damage.
