The problem with Mirror Mage is that having the mirror stance active makes you by default the highest threat enemy that they are likely to focus on, so you should be focusing more on the tanky battle mage part of things rather than spell blade, get a high Toughness score (Toughness, Willpower, Presence and then use a summon like Phyria or the flame summons from the Temple of Terrestrial Fire, + Warcry to keep that threat and Shatter), wear armor instead of robes and eschew Evasion based stuff in preference for Armor and Warding (if you dodge it, you can't learn it), Mare's Ring to keep you healthy, and keep a healbot like Cait or Queenly Rainment Ryn on the ready, don't use another tank. Then when you have picked up the powers you want (the wiki is useful for that, if incomplete, for example the patch notes for .6 said the new dungeon will have some new abilities a Mirror Mage can steal) swap back to spellpower based stuff and stop using Mirror Stance.
A spellblade meanwhile tends to be a very squishy glass cannon, if you want to swap to that then usual stats are Strength, Agility, Willpower and then get Cunning or Presence from Boons like drinks depending. Use Charge Weapon likely, paired with maybe Power Wave and then Shatter to keep some of the Mirror Mage aspect, and either Phyria summon or something like Deadly Shadow, Smite Evil or other strong weapon-tagged Encounter with Banishment or Assassinate as Ult, use either robes that provide Spellpower or Attack Power (not sure if any clothes provide that, the Tiran Vestments at least provide good Spellpower), or strong defenses like Royal Leathers, at this point do get some Evasion focused gear as you want to avoid being hit. Bring a tank with you (Arona, Atugia, Azzyran, Quin or Ice-Brint) as you no longer want to be hit... preferably one with both a tanking set and damage set, in case you spot some power you want to try to Mirror after all.
You said you would prefer not to swap classes, but if you decide to (it doesn't take longer than swapping your ability scores around after all) then Warrior is best for that tanky Battle Mage so you can keep high threat and a moderately good Initiative to get that summon active while still wearing heavy armor, then either Black Mage or Thief for that Spellblade, either one can work just as well. You can still stay Black Mage as the tanky battlemage but you'll probably have the lowest initiative in every encounter, and may have to use War Cry to keep the attention of the guys you want to blast you with the stuff you want to Mirror.
If you don't mind me asking, what gear would you recommend in general for a Battle Mage/Tank in general? I know you mentioned about wearing heavy armour, mare's ring but what weapons or specific gear would be best. Looking to try a Battle Mage as I have mainly just stuck with Black Mage as I liked the class lore lol.The problem with Mirror Mage is that having the mirror stance active makes you by default the highest threat enemy that they are likely to focus on, so you should be focusing more on the tanky battle mage part of things rather than spell blade, get a high Toughness score (Toughness, Willpower, Presence and then use a summon like Phyria or the flame summons from the Temple of Terrestrial Fire, + Warcry to keep that threat and Shatter), wear armor instead of robes and eschew Evasion based stuff in preference for Armor and Warding (if you dodge it, you can't learn it), Mare's Ring to keep you healthy, and keep a healbot like Cait or Queenly Rainment Ryn on the ready, don't use another tank. Then when you have picked up the powers you want (the wiki is useful for that, if incomplete, for example the patch notes for .6 said the new dungeon will have some new abilities a Mirror Mage can steal) swap back to spellpower based stuff and stop using Mirror Stance.
A spellblade meanwhile tends to be a very squishy glass cannon, if you want to swap to that then usual stats are Strength, Agility, Willpower and then get Cunning or Presence from Boons like drinks depending. Use Charge Weapon likely, paired with maybe Power Wave and then Shatter to keep some of the Mirror Mage aspect, and either Phyria summon or something like Deadly Shadow, Smite Evil or other strong weapon-tagged Encounter with Banishment or Assassinate as Ult, use either robes that provide Spellpower or Attack Power (not sure if any clothes provide that, the Tiran Vestments at least provide good Spellpower), or strong defenses like Royal Leathers, at this point do get some Evasion focused gear as you want to avoid being hit. Bring a tank with you (Arona, Atugia, Azzyran, Quin or Ice-Brint) as you no longer want to be hit... preferably one with both a tanking set and damage set, in case you spot some power you want to try to Mirror after all.
You said you would prefer not to swap classes, but if you decide to (it doesn't take longer than swapping your ability scores around after all) then Warrior is best for that tanky Battle Mage so you can keep high threat and a moderately good Initiative to get that summon active while still wearing heavy armor, then either Black Mage or Thief for that Spellblade, either one can work just as well. You can still stay Black Mage as the tanky battlemage but you'll probably have the lowest initiative in every encounter, and may have to use War Cry to keep the attention of the guys you want to blast you with the stuff you want to Mirror.
If you don't mind me asking, what gear would you recommend in general for a Battle Mage/Tank in general? I know you mentioned about wearing heavy armour, mare's ring but what weapons or specific gear would be best. Looking to try a Battle Mage as I have mainly just stuck with Black Mage as I liked the class lore lol.