Bounded Field

*Warning this spell uses the alternate mana point system for magic*

You create a field of Magic that surrounds an area that you have marks within range. While in this field you are aware of every creature within it.
Bounded Fields work on a subconscious level to prevent onlookers from noticing it.
To mages it requires a DC20 Arcana check when within a 5ft area, for every 10 ft its expanded the DC lowers by 5.
A bounded Field requires mana each day equal to the Range of the Bounded Field Divided by 10 eg 50ft equal 5 mana points
A Bounded Field can provide three different effects.

1. Defensive: To get into the Bounded field the unwelcomed intruder must make a attack at the Bounded Field the Ac of the Bounded Fields is equal to the Caster spell attack modifier and the Bounded field has Hit Points Equal to the amount of Mana put into it.

2.Offensive: Once inside the Bounded Field intruders will begin to feel the effects of the casters magecraft that the DM and the player may discuss(eg if they caster specialises in Necromancy then intruders may begin to rot away the long they stay)

3.Neautral: The Bounded Field takes on so special effects but the cost of the Bounded Field per day is halved (Rounded up)