Tides of Escalation

Brotherhood Psychic Spells gain the following:
You may cast this spell any number of times per
turn.
This spell costs {1} more per attempt of cast.
The roiling tides of the warp swell and heave. Mighty, rushing streams of power flow between the Sons of
Titan in a confluence of sorcery that unites their souls
in brotherhood.
-Grey Knight Codex