Create Portal

Using a cosmic engine, you create a portal to the Material plane. While the casting time is instantaneous the portal must be assembled up to 100 HP by applying 10 hit points per turn. In order to cast the spell, the caster must succeed a Int Saving Throw DC 12. Once summoned, each turn the caster remains concentrated on the portal it strengthens by 10 hit points. If concentration is broken, the spell will loose 10 hit points each turn until concentration is re established. Friendly creatures can spend a help action to reinforce your focus, adding +2 hit points to the portal on your turn.