Crown of dusk - located in the dark root basin after you defeat the hydra and kill the golem in the rear of the lake. (boosts all magic damage by 20% but suffer weakness to magic of 30%
Crown of the Dark Sun - you first have to defeat dark sun Gwyndolin located in Anor Londo then meet up with the merchant that is located in Firelink where the ring of sacrafice is and you can buy it. (boosts all magic damage by 10%
You are not special. You are not a beautiful or unique snowflake. You're the same decaying organic matter as everything else. PSN:Sleepyydwarf
Drop the pyromancy spells and pick up sorcery spells. Dexterity is the best stat for a Pyromancer since at 45, it maxes casting speed. The Pyroflame has INT adjustment, but that's only for the puny punch. Upgrading the Pyroflame via Laurentius and Queelana is how you make the Pyromancy spells stronger.
edit: to clarify, INT has absolutely no affect at all on how strong your pyromancy spells are. Unless you start going for sorcery spells, you royally screwed up that build.
PSN: Valkod Playing Dark Souls and Baldur's Gate Trilogy right now.