5E Roll Template Parameters

Background

Some spells, like Spiritual Weapon and Scorching Ray, can result in multiple attack and damage rolls. However, the basic &{template:atkdmg} (and others) expends a spell slot for each attack. I've been working on a macro that will expend a spell slot only on the first attack roll.

!script {{
--#sourcetoken|@(selected.token_id) {& select @{character_name}} 
--#reentrant|[*S:character_id]SpiritualWeapon
--#whisper|self
--#hideTitleCard|1
--?@\(@(selected.character_name)'s Spiritual Weapon|bar1[none]) -eq none|>Spawn;"[*S:character_name]'s Spiritual Weapon"
--:Attack|
--#hideCard|1
-->AttackRoll|[*S:character_id]

--X|
--:Spawn|TokenName
--iSpiritual Weapon is normally a 2nd Level Spell;What level spell slot are you using?|q;Slot;Cast at What Level?|Level 2,2|Level 3,3|Level 4, 4|Level 5,5|Level 6,6|Level 7,7|Level 8,8|Level 9,9
--?[*S:lvl[&Slot]_slots_expended] -lt 1|[--+Out of level [&Slot] slots!| --X| --]|

--=Slot|[&Slot] / 2 {FLOOR} 
--@forselected|{^& select [*S:character_name]}Spawn _name|[%1%] _offset|1,1 _bar1|[&Slot] _order|back

--^Attack|

--:AttackRoll|char id
--Rfind|[%1%];Spiritual Weapon;repeating_attack;atkname

--&Template|{^&template:atkdmg}
-->AddTemplateParameters|mod=+[*[%1%]:spell_attack_bonus]
-->AddTemplateParameters|rname=Spiritual Weapon
-->BuildRoll|r1;1d20cs>20 + [*[%1%]:wisdom_mod][WIS] + [*[%1%]:pb][PROF]
-->AddTemplateParameters|r1=[&r1]
-->AddTemplateParameters|always=1
-->BuildRoll|r2;1d20cs>20 + [*[%1%]:wisdom_mod][WIS] + [*[%1%]:pb][PROF]
-->AddTemplateParameters|r2=[&r2]
-->AddTemplateParameters|attack=1
-->AddTemplateParameters|range=60 feet
-->AddTemplateParameters|damage=1
-->AddTemplateParameters|dmg1flag=1
-->BuildRoll|dmg1;d8 + [*[%1%]:wisdom_mod][WIS]
-->AddTemplateParameters|dmg1=[&dmg1]
-->AddTemplateParameters|dmg1type=Force
-->BuildRoll|crit1;d8[CRIT]
-->AddTemplateParameters|crit1=[&crit1]
--=HLDice|[&Slot] - 2
-->BuildRoll|hldmg;(.49*[$HLDice])d8
-->AddTemplateParameters|hldmg=[&hldmg]
-->BuildRoll|hldmgcrit;(.49*[$HLDice])d8[CRIT]
-->AddTemplateParameters|hldmgcrit=[&hldmgcrit]
-->AddTemplateParameters|{^& if @\(@(selected.character_name)'s Spiritual Weapon|bar1[none]) = none}spelllevel=[&Slot]{^& end}
--/&Template|+ammo=1
--/>AddTemplateParameters|charname=@{character_name}
-->AddTemplateParameters|desc=[Show Spell Description](`https://app.roll20.net/editor/~[%1%]%7C[*R>spelldesc_link])

--@as|[*[%1%]:character_name] [&Template] {{charname=@{character_name}@(Macros|Braces.max)
--X|

--:AddTemplateParameters|parameter=value

--~Trim|string;trim;@(Macros|Braces.max)
--#debug|1
--&Template|+@(Macros|Braces)[%1%]
--&Template|+[&Trim]
--#debug|0
--<|

--:BuildRoll|roll name;roll content
--&[%1%]|[
--&[%1%]|+[
--&[%1%]|+[%2%]
--&[%1%]|+]
--&[%1%]|+]
--<|

}}

APIs Required:

ScriptCards

ZeroFrame

APILogic

Fetch

SelectManager

Emas

SpawnDefaultToken

5th Edition OGL by Roll20 Companion

Status

What this Spiritual Weapon macro does is check to see if there is a token on the VTT for the Spiritual Weapon, Spawn one if there is not, and then make an attack, expending a spell slot only on the first run of the macro (i.e., when the token is Spawned).

From the Roll Templates wiki: 

&{template:atkdmg} {{mod=mod}} {{rname=rname}} {{r1=r1}} {{always=1}} {{r2=r2}} {{attack=1}} {{range=range}} {{damage=1}} {{dmg1flag=1}} {{dmg1=dmg1}} {{dmg1type=dmg1type}} {{dmg2flag=1}} {{dmg2=dmg2}} {{dmg2type=dmg2type}} {{crit1=crit1}} {{crit2=crit2}} {{save=1}} {{saveattr=saveattr}} {{savedesc=savedesc}} {{savedc=savedc}} {{desc=desc}} {{hldmg=hldmg}} {{spelllevel=spelllevel}} ammo=ammo {{charname=charname}}

These are the available parameters for the template. I've married them into the above macro.

Caveats

• In order for the level field to properly expend the correct spell slot, the charname must resolve to match the exact name of a character sheet. (See spell slot tracking.)

Problem

Unfortunately, this part doesn't work. Compare:

You can also observe that the "Show Spell Description" link a) doesn't function and b) appears in the wrong place. I've examined the link which is generated by the baked-in 5e OGL API, and I'm confident that I have the correct structure for the link address itself, but clicking the link does nothing and it isn't in the right place.

The Question

What are the template parameters (i.e., {{parameter name=parameter content}}--like with {{charname=character name}}) that correctly identify the spell slot expenditure and create a functional link in the right place?