Spell parry works into negative MP

[Thenixon]

seen on charid 528, attacking 8576

- You summon dark forces and attempt to steal magic points from xxxx. You meet with success and drain 8 magic points from him! (2023-04-09 02:41:04).
- You attack xxxx with your Pallid Bolt spell and hit for 0 points of death damage. This attack also negated the Soul Fray status effect and replaced it with the Drained status effect for 10 status ticks. The attack weakened the barriers between the living world and the void! They made a quick gesture and the spell rebounded against you! You take 13 points of death damage! (2023-04-09 02:41:11).
- You summon dark forces and attempt to steal magic points from xxxx. However, he has no magic points for you to drain! (2023-04-09 02:41:22).
- You attack xxxx with your Pallid Bolt spell and hit for 0 points of unholy damage. They made a quick gesture and the spell rebounded against you! You take 16 points of unholy damage! (2023-04-09 02:41:41).
- You invoke dark and unholy curses into your spell. This takes a toll on your health and you take 6 points of damage. (2023-04-09 02:41:41).
- You attack xxxx with your Lancing Bolt triggered spell and hit for 15 points of piercing damage. This attack was laced with virulent, burning poison! You gain 20 XP. (2023-04-09 02:43:42).
- You attack xxxx with your Death Dart spell and hit for 0 points of death damage. They made a quick gesture and the spell rebounded against you! You take 9 points of death damage! (2023-04-09 03:01:29).

The wizard ended the interaction with -3 mp, after a regen of +2 at the tick.

[NearNihil]

This has been fixed and will be deployed with the next patch. I also discovered that Spell Turning used to cost 2 MP instead of 1 (as the messages would suggest), so I fixed that while I was at it. Also did some work on the internals of the spell parry/turning code, I think I tested everything thoroughly but if post-patch any hiccups show up, let me know.

[Goliath]

This has been fixed and will be deployed with the next patch. I also discovered that Spell Turning used to cost 2 MP instead of 1 (as the messages would suggest), so I fixed that while I was at it. Also did some work on the internals of the spell parry/turning code, I think I tested everything thoroughly but if post-patch any hiccups show up, let me know.