While I'm working on TFT spells, an idea floated to me.

The new rules say that armor has a certain number of armor points as usual, but on a successful attack someone wearing armor may choose to sacrifice an armor point and negate all damage.

In the same way magic items and spells can be set to provide protection points against specific types of damage such as fire, cold, acid, lightning, or sonic attacks. (so far, so good)

This protection can also extend to protection from certain types of creatures like Orcs and Dragons as well as extending to certain types of magic such as Arcane, Divine, Shamanistic, TFT-based wizards, Battlemages of Openquest, etc.

For clerics that worship specific gods , their totems could offer them a certain number of protection points against a different totem. For example, a Cleric with the Walrus totem could have four protection points from any attack from a Cleric that has the Octopus totem.

To go a bit further, you could have magic items with protection points against a specific color. In making these magic items, Red and Violet would be the easiest colors to generate. Black and White would be extremely difficult and Gray would be almost impossible. (Think about how many things are gray in elfgames.)

http://dngnsndrgns.blogspot.com/2017/03/tbh-rules-dev-armor-shields.html

    Now for the Duration of the spell.

It is listed as one turn with an upkeep cost of one spell point per turn.

In TBH, I would think that this is rounds. So do I keep spell points?

I could go with a duration of Concentration for the spell. It's new to The Black Hack and different enough, but if I don't give it a point cost, I'll have to deal with picking a level for it.

I changed one of the factor that goes into determining the spell level in a D&D-ish spell already, so let's just decide we need a spell point system. (Besides, that'll be more fun.)

For now, the duration is one round plus one round for every spell point spent. Does that mean spending a point per round or putting a number of spell points into it ahead of time.

Why not both? More tonight. 🙂

    To replace the default spells, I'll start with one spell and work through my assumptions to see where it leads.

In Warrior & Wizard, the effect of the Blur spell is Blur makes it harder for others to see, hear, smell, etc. the target of the spell.  (It's Thrown, so it is applied to a target, which can include the caster.)  All attacks against the target are at a -4 penalty; any Perception Checks against the target of the spell are at -4 as well.

Here's the first of my assumptions. Checks in TFT-like games are rolling a number of d6s to be equal to or less than an attribute. Since most rolls are 3d6, I'll treat a -4 penalty to checks as a -4 penalty in The Black Hack.

The Black Hack uses Advantage and Disadvantage, usually regarded as a +4 bonus (Advantage) or -4 penalty (Disadvantage). So we'll translate the effect in terms of advantage and disadvantage. TBH uses player-facing rolls, so at least for attacks, it would be roll advantage on a DEX check to avoid damage in combat. As far as opponents Perception checks, I never really ran into that playing TBH. Still, it's just as easy to say that the player rolls with Advantage on DEX checks to avoid others perceiving physical details about you.

Okay, we have one spell effect for my Black Hack with Different Magic system underway.