Theodoric's Spell Enhancer

Casting this spell before another enhances the 2nd. While concentrating on this spell, the next spell (not cantrip) cast by the caster gains an increase in Spell Save DC equal to half the number of rounds after casting Theodoric's Spell Enhancer, rounded up. While concentrating on this spell the caster has a movement speed of 0.

For example, a spell cast 1 round after gains a +1 benefit to its Spell Save DC, or +3 after 5 rounds.

The maximum amount of rounds that will enhance the 2nd spell is equal to the level at which Theodoric's Spell Enhancer was cast.